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Mathematics Questions and Answers March 13, 2023

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Actual lengths of stay at a hospital's emergency department in 2009 are shown in the following table ( rounded to the nearest hour ). Length of stay is the total of wait and service times. Some longer stays are also approximated as 15 hours in this table. 1- Hours: from 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 1 0 , 11 , 12 , 13 , 14 , to 15 2- Count:

the weather reports says there is a 40% chance of rain tomorrow . Give this information in terms of odds in favor of rain tomorrow.

CHAPTER 6 ANSWER THE FOLLOWING QUESTION and post your answer as a Word document in DROPBOX titled CHAPTER06_Q1. The vice president of operations at Busch Gardens knows that 70 percent of the patrons like roller-coaster rides. He wishes to have an acceptable margin of error of no more than +/- 2 percent and wants to be 95 percent confident about

the advertising for a cold remedy claimed that no other cold remedy acted faster. in an experiment to compare that remedy with another one, it did act faster on average, but the result was not significant. what does this mean? a. the difference was so small that it could have happened by chance even if the remedies were equivalent b. the

The government of Preon (a small island nation) was voted in at the last election with 62% of the votes. That was 2 years ago, and ever since then the government has assumed that their approval rating has been the same. Some recent events have affected public opinion and the government suspects that their approval rating might have changed. They

A recent study focused on the number of times men and women buy take out meals in a month. A random sample of 21 men had a sample mean of 24.51 and a sample standard deviation of 4.48. A random sample of 21 had a sample mean of 22.69 and a standard deviation of 3.86. Assume the samples are from normally distributed populations. At the 5%

Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table, what percentage of architects have Z scores: Above .10? Below .10? Above .20? Below .20? Above 1.10? Below 1.10? Above -.10? Below -.10?

Gabelli Partners is planning a major investment. The amount of profit X is uncertain but a probabilistic estimate gives the following distribution (in millions of dollars): Profit 1, 1.5, 2, 4, 10 Probability 0.1, 0.2, 0.4, ?? , 0.1 a. Find P(X = 4) = 0.2 b. Find the mean profit and the standard deviation of the profit. c. Gabelli Partners owes

The Vitamin C content of a particular brand of vitamin supplement pills is normally distributed with mean 490 mg and standard deviation 12 mg. What is the probability that a randomly selected pill contains at least 500 mg of Vitamin C? a) 0.7967 b) 0.8333 c) 0.0525 d) 0.1123 e) 0.2033

1. To find the 98% confidence interval for the population mean, for a situation in which n is greater than 30, what Z value would you use? Hint: do not use the Z table or your calculator to find this value. Express your answer to three places of decimal and state the positive value only. Note that you are unlikely in the 'non-school' world to

The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an average (mean) of 1.85pounds with a standard deviation of 1.02pounds. In a recent study, a group of 45people who used this pill were interviewed. The study revealed that these people lost a mean of 1.95pounds after one week. If the producer's claim

Name:_________________________________ Hypothesis Testing - In Class Activity The Significance of a Kiss I. Purpose: This activity is intended to illustrate properties of hypothesis testing and to describe how to perform hypothesis tests on a proportion. II. Materials and Introduction: 1. Each person should have 10 KISSES chocolates of the same

To determine how much work to do in the remaining 3 weeks, Pat needed to be able to predict the final exam mark on the basis of the assignment mark (worth 20 points) and the midterm mark (worth 30 points). Pat's marks on these were 12/20 and 14/30, respectively. Accordingly, Pat undertook the following analysis. The final exam mark, assignment

Information about the proportion of a sample that agrees with a certain statement is given below. UseStatKeyor other technology to estimate the standard error from a bootstrap distribution generated from the sample. Then use the standard error to give a 95%confidence interval for the proportion of the population to agree with the statement. In a

A study looked at employee behavior, namely absenteeism, promptness to work, and turnover. The study found that 40%of the employees had problems with absenteeism, also, 60%had problems with turnover. Suppose that 30%of the employees had problems with both absenteeism and turnover. Use this information to find the probability that an employee

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john makes $2,800 per month and has an opportunity to invest $150 per month at APR of 4.5% in a 401K plan through work.he plans to retire in 30 years.if income taxes are at 20% for him.how much will he deposit into the 401K over the 30 years?

A set of data has an SSE = 6 and SST = 16. If b 1 > 0, then the coefficient of correlation is a. 0.625 b. 0.375 c. d. negative square root of .625

At the 95% level of confidence, the estimate of the percentage of all Philadelphia police officers who believe moral is high within the department is _____. (10 points) 31% - 39% 62.5% - 67.5% 60% - 70% 58.5% - 71.5% A,B,C,D???

The average hourly wage of employees of a certain company is $12.51. Assume the variable is normally distributed. If the standard deviation is $5.00, find the probability that a randomly selected employee earns less than $9.76.

Topic of the study: I am going to evaluate the relationship between the level of schooling attended by various persons and their children. I have utilised both the quantitative and qualitative variable in my research method. Here the qualitative variable is level of schooling attended by various persons and the quantitative variable is their

Hello! Can anyone help me? I need help with this assignment please!

Provide an appropriate response. Suppose you pay $3.00 to roll a fair die with the understanding that you will get back $5.00 for rolling a 1 or a 6, nothing otherwise. What is your expected value?

A time series trend equation for Hammer Hardwareis Y = 5.6 + 1.2t, where sales are in millions of dollars and t increases by one unit for each year. If the value of sales in the base year of 2016 is $5.6 million, what would be the estimated sales amount for 2018?

Lab 11 In this lab we will perform testing of hypotheses related to the population mean. This material is in Section 13.2. Three national bottling companies distribute cans of soft drinks labeled as containing 16 oz. We take the view that, to save money, they may put slightly less in each can, on average, so we'll test H0 : = 16 vs. Ha : < 16,

Use the following information for questions 1 to 5. The Bagel Company wishes to expand to Michigan and needs to decide where to locate its first store. A sample of 45 East Lansing residents (n1) spent an average of $52.87 a month on bagels with a variance of 8.76. A sample of 37 Ann Arbor residents (n2) spent an average of $61.98 a month on bagels

I will give you as you complete each. Question 1: Has A--? Parts.... Question 2 Question 3 Question 4 Question 5 Question 6 I will give you as you complete each. Question 1: Has A--? Parts.... Question 2 Question 3 Question 4 Question 5 Question 6 I will give you as you complete each. Question 1: Has A--? Parts.... Question 2 Question 3 Question 4

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Multi-threaded processing for PROC SORT will effect which of these system resources? A. CPU time will decrease, wall clock time will decrease B.CPU time will increase, wall clock time will decrease C. CPU time will decrease, wall clock time will increase D.CPU time will increase, wall clock time will increase

Find the critical value for the level of significance. include a graph with your answer. Right-tailed test, alpha=0.05

A. Sivathayalan, M. Nasari, Z. Montazeri STAT 2507 Assignment # 3 (Chapters 6, 7 and 8) Due: Tuesday, March 22, 2016, in class Last Name Student # Tarannum First Name 100838870 Your LAB Section Rehnuma H3 Note: Use spaces left to answer all questions. The total of marks for the questions is 100. In case the individual marks are not assigned,

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Match eachitem with the corresponding element of a Linear Program. Constraint | Left-hand side | Objective Function | Decision Variables | Right-hand side = 88 8X + 11Y

A researcher wishes to estimate, with 95 % confidence, the population proportion of adults who think the president of their country can control the price of gasoline. Her estimate must be accurate within 3 % of the true proportion. a) No preliminary estimate is available. Find the minimum sample size needed. b) Find the minimum sample size needed,

Men hrs./mont hly 34.4 25.8 25.8 34.4 68.8 25.8 34.4 17.2 34.4 68.8 68.8 17.2 25.8 17.2 32.25 17.2 25.8 43 516 43 68.8 25.8 25.8 60.2 34.4 43 43 25.8 34.4 17.2 34.4 68.8 34.4 43 19.35 68.8 32.25 12.9 43 43 38.7 34.4 43 344 25.8 25.8 34.4 25.8 25.8 34.4 60.2 25.8 68.8 34.4 Monthly current fee $700.00 $500.00 $500.00 $600.00 $850.00 $450.00 $550.00

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Use the Poisson model to approximate the probability. Round your answer to four decimal places.The probability that a call received by a certain switchboard will be a wrong number is 0.02. Use the Poisson distribution to approximate the probability that among 140 calls received by the switchboard, there are no wrong numbers.

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Name(s) ECON 2370: Introduction to Economic Data Analysis Due date: Monday, March 18 (Mo-We section) Tuesday, March 19 (Tu-Th sections) PS# Class time: Spring 2016 Homework # 7 1. To study the effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow. Construct an

What are the components in the equation VAR( T ) = VAR( X ) R, what do they mean, and why is this equation so important?

Math | Graded Assignment | Unit Test, Part 2 | Relationships Between Variables Name: Date: Graded Assignment Unit Test, Part 2: Relationships Between Variables Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full credit. Total score: ____ of 24 points (Score for Question 1: ___ of 12

The null and alternate hypotheses are: H 0 : d 0 H 1 : d > 0 The following sample information shows the number of defective units produced on the day shift and the afternoon shift for a sample of four days last month. Day 1 2 3 4 Day shift 11 10 14 19 Afternoon shift 10 9 14 16 At the .01 significance level, can we conclude there are more defects

The production department of Celltronics International wants to explore the relationship between the number of employees who assemble a subassembly and the number produced. As an experiment, 2 employees were assigned to assemble the subassemblies. They produced 13 during a one-hour period. Then 4 employees assembled them. They produced 22 during a

DreamWorks animated movies for the U.S. box office up to July 2013 are shown in the table, in millions of dollars. Movie: $Millions Shrek 2 441 Shrek 3 323 Shrek 268 Shrek 4 268 Dragon 218 Madagascar 3 217 Kung Fu 215 Monsters 198 Madagascar 194 The Croods 186 A. Find and interpret the median box office dollars for the ten top-grossing DreamWorks

100 Words per question 1. What is a confidence interval estimate and why is it important to you as a researcher? 2. As you begin your research project you will have to start thinking about sampling your population. Some might consider this a waste of time but you believe otherwise. What are the five reasons why researchers sample? Pick at least

uiz #2`Name________________________ Section No. _____________ (5%)1. A pollster selected 4 of 7 available people. How many different groups of 4 are possible? nCr = n! / ( r! (n - r)! ) nCr = 7! / ( 4! (7-4)! ) nCr = 35 10%2. Your firm has a contract to make 2000 staff uniforms for a fast - food retailer. The heights of the staff are normally

Biostats SDS 328M Homework 6 Write your answers onto one or more separate sheets of paper. Clearly mark each sheet with your name and your lab time. Show all work for full credit. Round all answers to at least 3 decimal places and assume, unless otherwise noted, that =0.05 1. Ten percent of people in the US are left-handed. A researcher wants to

The mean income per person in the United States is $35,500, and the distribution of incomes follows a normal distribution. A random sample of 8 residents of Wilmington, Delaware, had a mean of $39,500 with a standard deviation of $8,200. At the 0.01 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware,

3 1) A study of violence and peer acceptance reported descriptive results for male and female students. The average age for 17 male students was 15.79 with a standard deviation of 2.01. Construct a 99% confidence interval for the average age of male students. What is the lower bound for this confidence interval? a. 15.36 b. 13.96 c. 14.50 d. 14.32

A textile producer has established that a spinning machine stops randomly due to thread breakages at an average rate of 5 stoppages per hour. What is the probability that in a given hour: i) 3 stoppages will occur on this spinning machine? ii) at most 2 stoppages will occur on this spinning machine? iii) more than 4 stoppages will occur on this

1, You are testing the null hypothesis that= 0 versus the alternative> 0 using= .05. Assume=17. Supposex=4.8andn=12. Calculate the test statistic and itsP-value. Repeat assuming the same value ofxbut withn=22. Do the same for sample sizes of32,42, and52. (Round the test statistic to two decimal places. Round theP-value to four decimal places.)

A rainstorm in Portland, Oregon, wiped out the electricity in 5% of the households in the city. Suppose that a random sample of 80% Portland households is taken after the rainstorm. Estimate the number of households in the sample that lost electricity by giving the mean of the relevant distribution (that is, the expectation of the relevant random

which of the statements about distribution of the sample statistic is True? a) As the sample size increases the standard error becomes larger b) the mean of the sample distribution is usually close but not equal to the population mean. c) the distribution of the sample statictics is approximately normal whenever the sample size is sufficiently

Assume each newborn baby has a probability of approximately 0.53of being female and 0.47of being male. For a family with four children, let X equals=number of children who are girls. a. Identify the three conditions that must be satisfied for X to have the binomial distribution. b. Identify n and p for the binomial distribution. c. Find the

A survey has been conducted to estimate the usage of high-speed internet in the local area. 162 households were surveyed and asked whether they used high-speed internet at their home. 110 households surveyed responded that they do have a high-speed internet connection at home. a)Calculate the margin of error for the 95% confidence interval for the

The mean diastolic blood pressure for a random sample of100people was97millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be10millimeters of mercury, find a95%confidence interval for the true mean diastolic blood pressure of all people. Then complete the table below. Carry your intermediate

NEED HELP WITH #11 Exhibit 6-1 The assembly time for a product is uniformly distributed between 6 and 10 minutes. 9 . Refer to Exhibit 6-1. The mean and the variance of the assembly time are: a. 4 minutes and 16 (minute) 2 b. 8 minutes and 1.1547 minutes c. 8 minutes and 1.3333 (minute) 2 d. 1.1547 minutes and 8 minutes ANS: C 1 0 . Refer to

s 1 and 2 are based on these facts. \"We Get It Done Right\" is the advertising slogan for Ace Construction. Ace is currently involved in four independent construction projects and estimates that each project has a 40% chance of being completed late and a 60% likelihood of being on-time. Each day a project is late, Ace is accessed a 10% late fee.

What are opportunity costs? How are they used in the Hungarian Method?

1. QUESTION 1 Find the indicated probability. A IRS auditor randomly selects 3 tax returns from 49 returns of which 7 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places. 0.00 29 0.62 97 0.62 31 0.00 19 QUESTION 2 1. Is Event B dependent or independent of Event A? A: A green ball

The president of a large university wishes to estimate the average age of the students presently enrolled. from past studies, the variance is known to be 4 years. A sample of 49 students is selected and the mean is found to be 23.2. find the 96 % confidence interval of population mean. (show work)

The following probability distribution represents the number of bedrooms in a randomly selected US household. To simplify matters, the category \"five or more\" is replaced by \"5\" (Source: US Census, American Fact Finder). Calculate the variance of the number of bedrooms per household. Number of Bedrooms X 0 1 2 3 4 5 a. 0.017 b. 1.070 c. 1.145

6. (TCO C) An auditor for the U.S. Postal Service wants to examine its special Two-Day Priority mail handling to determine the proportion of parcels that actually require longer than 2 days for delivery. A randomly selected sample of 100 such parcels is found to contain seven that required longer than 2 days for delivery. a. Compute the 90%

Samples of packages orders were taken at the R.A. Treinta Package Co. to determine if the orders were prepared correctly. The percent defectives for each sample are given in the worksheet Prob. 8-41 in the C08Data.xlsx file on the Student Companion Site for this chapter 25 samples. Five hundred orders are inspected each day for each sample.

StatCrunch Assignment 1 - Part B (1B) This page explains the assignment. The questions you need to answer are on the next page. A key part of research involves formulating interesting questions and then developing a methodology and collecting appropriate data to answer those questions. In this assignment, assume that you are the researcher who

Exercises 13.3 Model Assumptions and Common Violations 31. A simple linear regression, y = 0 + 1x + , is estimated with time series data. The resulting residuals e and the time variable t are shown in the accompanying table. a. Graph the residuals against time and look for any discernible pattern. b. Which assumption is being violated? Discuss its

The five-year survival rate for Caucasians for all forms of cancer increased from 36 % in the 1960s to 59% now. Express this change in two ways: (1) as an absolute difference in terms of percentage points and (2) as a relative difference in terms of percent. How many percentage points did it increase? Round to nearest tenth The 5 year survival

Find the indicated probabilities using the geometricdistribution, the Poissondistribution, or the binomial distribution. Then determine if the events are unusual. Ifconvenient, use the appropriate probability table or technology to find the probabilities. Assume the probability that you will make a sale on any given telephone call is 0.17. Find

Tompkins Associates reports that the mean clear height for a Class A warehouse in the United States is 22 feet. Suppose clear heights are normally distributed and that the standard deviation is 4 feet. A Class A warehouse in the United States is randomly selected. (a)What is the probability that the clear height is greater than 18 feet? (b)What is

TYPE OF INSTRUCTION Previous experience No previous experience New M=230.00 Conventional M=200.00 ROW MEANS M=215.00 M=200.00 M=230.00 M=215.00 COLUMN MEANS M=215.00 M=215.00

To solve this addition using base 10 blocks.Tell if you needed to regroup. 336 +111= then Regroup 10 ones to make new ten. Secondly,Regroup 10tens to make new hundred

Question 19 of 20 1.0 Points In general, increasing the confidence level will narrow the confidence interval, and decreasing the confidence level widens the interval. True False Reset Selection Question 20 of 20 1.0 Points As a general rule, the normal distribution is used to approximate the sampling distribution of the sample proportion,, only if

IQ scores among the general population have a mean of of . A researcher claims that the standard deviation, not equal to . A random sample of a standard deviation of and a standard deviation , of IQ scores for females is IQ scores for females had a mean of and . Assuming that IQ scores for females are approximately normally distributed, is there

Workbook Contents U.S. Field Production of Crude Oil (Thousand Barrels) Click worksheet name or tab at bottom for data Worksheet Name Description Data 1 U.S. Field Production of Crude Oil (Thousand Barrels) Release Date: Next Release Date: Excel File Name: Available from Web Page: Source: For Help, Contact: # Of Series Frequency 1 Annual 3/15/2013

In a survey of 3963 adults, 706 say they have seen a ghost.Construct a 99% confidence interval for the population proportion. Interpret the results. 1)A 99% confidence interval for the population proportion is ( , ) 2)Interpret your results. Choose the correct answer below A)With 99% confidence, it can be said that the population proportion of

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A laboratory in Washington is interested in finding the mean chloride level for a healthy resident in the state. A random sample of 80 healthy residents has a mean chloride level of 101 mEq/L. If it is known that the chloride levels in healthy individuals residing in Washington have a standard deviation of 38 mEq/L, find a 99% confidence interval

Linear Programming Project 20 Points Problem: A certain corporation has three branch plants with excess production capacity. Fortunately, the corporation has a new product ready to begin production, and all three plants have this capability, so some of the excess capacity can be used to produce the new product. This product can be made in three

A vending machine at City Airport dispenses hot coffee, hot chocolate, or hot tea, in a constantservice time of 20 seconds. Customers arrive at the vending machine at a mean rate of 60 perhour (Poisson distributed). Determine the operating characteristics of this system. What is the value of lambda? What is average time customers wait in line?

An inspector correctly identifies defective products 90% of the time. For the next 10 products, what is the probability that he makes fewer than 2 incorrect inspections?

In one survey, successful female entrepreneurs were asked to state their personal definition of success in terms of several categories from which they could select. Thirty-nine percent responded that happiness was their definition of success, 12% said that sales/profit was their definition, 18% responded that helping others was their definition,

Consider a pool of six I/O buffers. Assume that any buffer is just as likely to be available or occupied as any other. Compute the probabilities associated with the following events: A = At least two but no more than five buffers occupied. B = At least three but no more than five buffers occupied. C = All buffers available or an even number of

Chapter 21, Problem 7 In the table in the textbook on page 511 you will find survival times in months since diagnosis for 10 AIDS patients suffering from concomitant esophageal candidiasis, an infection due to Candida yeast, and cytomegalovirus, a herpes infection that can cause serious illness. Censored observations are denoted by a plus sign. a.

What percentage of the general U.S. population have bachelor's degrees? The Statistical Abstract of the United States, 120th Edition, gives the percentage of bachelor's degrees by state. For convenience, the data are sorted in increasing order. 16, 17, 17, 17, 18, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 23, 23, 23, 23, 23, 23,

Express the confidence interval ( 0 . 0 8 3 , 0 . 1 3 9 ) in the form of p E < p < p + E (there are carrots above the first and third p's in the equation but can't put them in on here)

) Is there a relationship between the raises administrators at State University receive and their performance on the job? A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the straight-line regression model, Image Using the method of least squares, the faculty

Essay 1. Since food trucks have been gaining popularity, Mi Casa Front Porch is testing a seasonal food truck for special events around the Phoenix Metropolitan area. The data gathered by the research team identified that the average menu item from food trucks was $6.50 and daily revenue at the events was $9500.00 with a standard deviation of

Six Sigma Your Reading defines Six Sigma as using statistics for measuring variation in a process with the intent of producing error free results. Is this possible in health care? What is your personal and professional opinion on this? Explain your response. Shaw and Carter, Quality and Performance Improvement in Health Care, 6 th edition, AHIMA

The normal distribution is a family of distributions that is often used to model operational processes. Based on your readings for this module, give one example, different from those supplied in the overview, of how the normal distribution can be used in an operations or production environment. This example may be from your own experience. Be sure

Joe scored 650 on the Math portion of the SAT. In the population, SATscores average 500, with a standard deviation of 100. What percentile does this put Joe in?

Which of the following statements is not true about a sampling distribution? A) It is the probability distribution of a statistic. B) It gives characteristics of the estimator, such as bias and precision. C) It gives probabilities for a statistic. D) It is used for making inference about a sample.

) Tires: A tire manufacturer believes that the tread life of its snow tires can be described by a normal model with a mean of 32,000 miles and standard deviation of 2500 miles. If you buy one of these tires, would it be reasonable for you to hope it will last 40,000 miles? Explain. Approximately what fraction of these tires can be expected to last

The annual rate of return on a mutual fund is normally distributed with a mean of 6% and a standard deviation of 3%. What is the probability that the fund returns more than 7% next year?

Course Project Project Examples: t-Test Project 1. The 1-sample t-test Required elements: one population, one quantitative variable, a specific value for hypothesis Example scenario: Population: All 2-bedroom apartments in Lumpkin County Variable: monthly rent Research question: Is the average rent for a 2 bedroom apartment in Lumpkin County more

BAD 2323 Ch8 Hwk CONFIDENCE INTERVALS 1. A study is made to determine how much was spent for a product. A sample of 1,000 people was taken. The sample mean was $300 and the sample standard deviation was $90. Calculate: a. the 68.3% confidence interval b. the 95.4% confidence interval c. the 99.7% confidence interval. 2. A sample of 400 names is

Construct the following digital circuit with Logisim. The circuit has two outputs S and T and three inputs A, B and C. S = /AB/C + A/B/C + /A/BC + ABC T = /ABC + A/BC + AB/C + ABC

PROPOSAL PAPER METHODS PART THREE INSTRUCTIONSThe remaining methodology must be addressed in Part Three of the methods section. What procedures were used to collect and analyze the data? Note: all research proposals must be quantitative in nature for the purposes of this course. If you wish to use a qualitative component, a mixed design must be

There are 660 women in a village and the sum of their heights are 3,511.2 feet. what is their average height?

The dean of a university estimates that the mean number of classroom hours per week for full-time faculty is 11.0. As a member of the student council, you want to test this claim. A random sample of the number of classroom hours for eight full-time faculty for one week is shown in the table below. At alphaequals0.01 ,can you reject the dean's

According to Runzheimer International, in a survey of relocation administrators 63% of all workers who rejected relocation offers did so for family considerations. Suppose this figure was obtained by using a random sample of the files of672workers who had rejected relocation offers. Use this information to construct a 95% confidence interval to

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