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Mathematics Questions and Answers February 25, 2023

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One can calculate the 95% confidence interval for the mean with the population standard deviation known. This will give us an upper and a lower confidence limit. What happens if we decide to calculate the 99% confidence interval? Describe how the increase in the confidence level has changed the width of the confidence interval. Do the same for the

In addition to the solutions for the problem set if possible, could you also include the excel spreadsheet? Thank you

The standard error of the mean measures the dispersion of the sampling distribution of the sample mean. false or true

I have a feww questions that I need answered because I have a exam to take and I don't know how to explain the following. 1. What happens when the effect size of the study is increased by exaggerating levels of the IV? 2. What happens when a researcher increases the standard deviation in their sample (i.e., their sample has more variability)? 3.

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Details Mean, Variance and Standard Deviation Excel Worksheet Due Date: Aug 21, 2016 23:59:59 Max Points: 90 Details: Refer to the "Visual Learner: Statistics" for examples to help complete the problems in the "Topic 1: Mean, Variance, and Standard Deviation" worksheet. Also, to aide in the Excel calculations, view the appropriate section of the

1.The mean selling price (in $ thousands) of the homes was computed earlier to be $221.10, with a standard deviation of $47.11. Use the normal distribution to estimate the percent of homes selling for more than $280.00. Need help on how to compute in excel

Size($) Rent(sq.feet) 850 1950 1450 2600 1085 2200 1232 2500 718 1950 1485 2700 1136 2650 726 1935 700 1875 956 2150 1100 2400 1285 2650 1985 3300 1369 2800 1175 2400 1225 2450 1245 2100 1259 2700 1150 2200 896 2150 1361 2600 1040 2650 755 2200 1000 1800 1200 2750

Use the given values to find the following. (Enter your answers as fractions.)P(A) =0.7,P(B) =0.3,P(AB) =0.2 (a)P(AgivenB) (b)P(BgivenA)

suppose the customers in a hardware store are willing to buy N(p) boxes of nails at p dollars per box, as given by the following function. N(p)= 70-5p^2; 1 less than or equal to P less than or equal to 4 find the average rate of change of demand for a change in price from 2 to 3 dollars

Print by: Mary Stela Gallegos HS312: Epidemiology and Biostatistics II 1504C / HS312 Unit 6 Assignment Drawing Conclusions Suppose that study A and study B both involve comparing two groups. Study A is an observational study, and the value turns out to be value turns out to be . Study B is a randomized experiment, and the . a. Which study provides

#53 Which of the following describes the appropriate measurement system characteristic when the same employee, taking multiple measurements on the same item, gets the same result every time? A Repeatability B Accuracy C Reproducibility D Resolution

I really neeed help with this Question 1 of 20 1.0 Points Numerical variables can be subdivided into which two types? A.Cross-sectional and discrete B.Diverse and categorical C.Discrete and continuous D.Nominal and progressive Reset Selection Question 2 of 20 1.0 Points Which of the following statements is true regarding the data set 10, 10, 10,

. Choose the appropriate statistical measure for each proposed study. A researcher and sports enthusiast is interested in knowing if the salaries of professional baseball players are significantly higher or lower than the salaries of professional basketball players. She samples 100 professional baseball players and 100 professional basketball

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The workers' union at a certain university is quite strong. About 96% of all workers employed by the university belong to the workers' union. Recently, the workers went on strike, and now a local TV station plans to interview a sample of 10 workers, chosen at random, to get their opinions on the strike.

No plagiarism no and no. Prepare a short research paper of approximately 1500 words, double-spaced, exclusive of cover, title page, and table of contents, endnotes and bibliography. Your paper must use APA formatting with the exception that tables and figures can be inserted at the appropriate location rather than added at the end. Submit the

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You have been asked to review a control chart and investigate any abnormal (or special cause) variation. Which of the following options is NOT a good indication of abnormal or special cause variation? A Data points outside the control limits, regardless of their proximity with respect to the specification limits B Data points inside the control

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11. (a) Given the set A = {1, 2, 3} and the set S = {(x, y) | x and y in A}. Consider the relation defined on S as follows: ((x1, y1) (x2, y2) if x1 x2 and y1 y2. Draw the directed graph of this relation. Show that it is a partial order. Explain why it is not a total order. (b). Consider the set S defined in problem 4 and the following relation =

MATH-1326-THQ 6, 2016-10-04 19:47 (Printed First Name) (Printed Last Name) \u0012 \u0013 XXX0000 Net ID (First Letter of Last Name) \u0012 \u0013 001 - 503 Section Take Home Quiz 6 Penalty Instructions 1. Fill in the requested information on the line above. 2. This handout is due at the beginning of lecture on Tuesday (10-11-2016). One point

7. Dr. Henry believes that if he gives a short quiz (0-5)before he lectures and then the same short quiz (0-5)after he lectures his student will retain more information from his lecture. He give his 45 the short quiz then lectures and gives the same 45 students the same quiz. (Total 18 pts) A. What are the independent and dependent variables and

A sample of 40 observations is selected from a normal population. The sample mean is 31, and the population standard deviation is 3. Conduct the following test of hypothesis using the 0.05 significance level. H 0 : 30 H 1 : > 30 a. Is this a one- or two-tailed test? "One-tailed"-the alternate hypothesis is greater than direction. "Two-tailed"-the

Assume the random variable X is normally distributed with mean equals=50 and standard deviation sigma equals = 7 . Find the 81st percentile?

Ignore my work and help me to do the homework. I don't understand some of the questions

Statistical Process Control Problems: The Canine Gourmet Company produces delicious dog treats for canines with discriminating tastes. Management wants the box-filling line be set so that the average weight per box is 43.5 grams. When the process is in control, the range in the weight of each sample has averaged 10 grams. (Therefore, X-double bar

13. Mary will walk one day and swim one day. She does at most one activity on any particular day. How many ways are there for her to select her workout schedule (i.e. which activities her does which days)?

An Internal Revenue Oversight Board survey found that 82% of taxpayers said that it was very important for the Internal Revenue Service (IRS) to ensure that high-income tax payers do not cheat on their tax returns ( The Wall Street Journal, February 11, 2009). For a sample of eight taxpayers, what is the probability that at least six taxpayers say

The Middlecreek Branch of the national bank of Virginia has 8 real estate loans over $1,000,000. Of these 8 loans, 3 are "underwrite." A loan is underwater if the amount of the loan is greater than the value of the property. The chief loan officer decided to randomly select five of these loans to determine if they met all banking standards. A.

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A penny, a nickel, and a dime are in a box. Bob randomly selects a coin, notes its value, and returns it to the box. He then randomly selects another coin from the box. Show all possible outcomes by drawing a tree diagram or by representing the possible outcomes as a set of ordered pairs. b) What is the probability that the same coin will be drawn

The following table is a probability distribution for the random variable x. x f(x) 5 0.10 15 0.60 25 0.30 1 The expected value of x is: E(x) = ______. a 17 b 15 c 14 d 12

Consider the following probability distribution function. f(x) ={ C(0.6)2.5 x3.5 for x > 0.6 0 otherwise (a) (5 points) What is the value of the constant C? (b) (5 points) What is the mean of this distribution? (c) (5 points) What is the variance of this distribution? (d) (5 points) What is the probability X 10?

5 EBF 473 Due in class, Thursday December 10 1) (40 pts) On April 22 2011, at market close, the price of BP (symbol BP) was 40.50. The prices of various call options with expiration on July 22 2015 is set out below. Given this, derive the smile for BP. Assume the annual interest rate is 3.0%. Strike Price Price $27.50 $14.17 $30.00 $11.26 $32.00

The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diametergreater than0.32 inches? 47.72% 37.45% 2.28% 97.72% Find the z-score for which the area under the standard normal curveto its leftis 0.96 1.82 -1.38 1.03 1.75

Year 1950 1953 1957 1960 1962 1965 1968 1970 1972 1976 1980 1984 1987 1989 1992 1994 1996 1998 2000 Number Graduated 203 211 288 319 381 446 439 521 509 527 476 413 399 362 379 413 437 426 451 Number Graduated 600 500 400 300 200 100 0 1940 1950 1960 1970 1980 1990 ber Graduated 1970 1980 1990 2000 2010

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Explain what is meant by the probability of an event? Also name the main properties of probability? Describe the 3 main ways of defining probability This question was ask easrlier but no response?

two sample normal distribution x 1, x 2,..., x n ~iid N ( mu 1, sigma 1 2 ) y1, y 2,..., y m~iid N ( mu 2, sigma 2 2 ) would you write the joint pdf , then rewrite it as exponential family (as acanonical form), please i want the sufficient statistics to be ( x bar, y bar, S x 2 , S y 2).

The null and alternate hypotheses are: H0: 1 = 2 H1: 1 2 A sample of 200 observations from the first population indicated that x1 is 170. A sample of 150 observations from the second population revealed x2 to be 110. Use the .05 significance level to test the hypothesis. a. State the decision rule. b. Compute the pooled proportion. c. Compute the

The Wall Street Journal's Shareholder Scoreboard tracks the performance of 1000 major U.S. companies (The Wall Street Journal, March 10, 2003). The performance of each company is rated based on the annual total return, including stock price changes and the reinvestment of dividends. Ratings are assigned by dividing all 1000 companies into five

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Hi, can someone explain Sturges formula? I know the formula is 1 + 3.3 log (n). If n is 50, what is the number of class intervals?

A table of values forf,g,f ', andg'is given. 1 3 2 4 6 2 1 8 5 7 3 7 2 7 9 (a) Ifh(x) =f(g(x)), findh'(3). h'(3) = (b) IfH(x) =g(f(x)), findH'(2). H'(2) =

In how many ways can a committee of size 13 be formed from 16 people? Assume that, when people are chosen for a committee, the order of the choices does not matter

1. A florist is going to make afive flower arrangement from the following flowers: a lily, a rose, a carnation, a daisy, a dahlia, and an iris. What is the probability of her not choosing a daisy? *Enter the fraction using the division sign. Ex) 6/7 2.A town orchestra is holding auditions for 3 new flute players and 4 new trumpet players. If 8

Imagine that you have been asked by your local police department to help improve the level of engagement and interaction the police has with your community. Create a brochure using the Brochure Builder for distribution in your area that explains the concept of community policing to local citizens. Be sure to include at least three ways that

A real estate agent wishes to determine the selling price of residences using the size (square feet), and whether the residence is a condominium or a single-family home. A sample of 20 residences was obtained with the following results: Price ($) Type 184,400 C 185,200 C 187,200 C 190,900 C 197,100 F 199,700 F 200,600 C 203,100 F 207,200 F 208,000

As a result of testing 20,000 Electric Bulbs manufactured by a company, it was found that the lifetime of the bulbs was normally distributed with a mean life of 2040 hours with a Standard Deviation of 60 hours. On the basis of the information, estimate the number of bulbs expected to burn for (i) More than 2150 hours (ii) More than 2000 hours

Tilting things in your favor Guide to Investing The EndRun Financial Services \"Show Me The Data\" Guarantee Given the questionable practices of security firms today, you're understandably skeptical about any investment claim. That's why we're happy to show you the data to back up our claims in this guide! We aim for 100% customer satisfaction!

MATH 221 Statistics for Decision Making Week 6 iLab Name:_______________________ Statistical Concepts: Data Simulation Confidence Intervals Normal Probabilities Short Answer Writing Assignment All answers should be complete sentences. We need to find the confidence interval for the SLEEP variable. To do this, we need to find the mean and then find

Number of individuals arriving at boarding counter on an airport is an example of

While working for Life magazine, Archie is assigned to the Galapagos Islands to photograph a rare, giant white turtle. The turtle can be found either on Isabella, the largest of the 16 Galapagos islands, or on Santa Cruz, the next largest island. Many have tried to locate the giant turtle, but 79% of them have failed. In addition, out of every

(Use the t table) A restaurant decides to test their oven's thermostat to see if it is working properly, that is, if the actual temperature inside the oven is the same as the temperature to which the thermostat was set. Twenty times, the oven was set at 350 degrees and then the temperature was measured with a thermometer. Ho: mu = 350 and Ha: mu

1 of 20 1.0 Points Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. Complex numbers should be in the form (a + bi) where "a" and "b"

If x is normally distributed with u= 20.0 ando= 4.0, determine the following (u and o stand for the greek letters mu and sigma) Please round your answers to 3 decimal places. a. P(x 20.0) = b. P(16.0 x 24.0) = c. P(x 12) = d. P(x = 22.0) = e. P(12.0 x 28.0) = f. P(x 16) =

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what is the easiest method for adding and subtracting fractions where the numbers on the bottom are different .

Find all the values of x where the tangent line is horizontal f(x)=x^3-4x^2-8x+17

Let f(x) = x^2 and g(x) = 1 + x. Find and simplify the indicated composite function.Also, state the domain of the composite function.(f g)(x)

Show that for three events A, B and C P[A B | C ] = P ( A | C ) + P ( B | C ) P ( AB | C )

Suppose you have a distribution, X, with mean = 22 and standard deviation = 3. Define anew random variable Y = 3X + 1. a. Find the variance of X. b. Find the mean of Y. c. Find the variance of Y. d. Find the standard deviation of Y.

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An increased number of colleges have been using online resources to research applicants. According to a study from lastyear,38%of admissions officers indicated that they visited an applyingstudent'ssocial networking page. A random sample of 200admissions officers was recently selected and it was found that 85of them visit the social networking

1.A sample of 57 observations will be taken from a process (an infinite population). The population proportion equals 0.15. The probability that the sample proportion will be less than 0.17 is (Round your answer to 4 decimal places.) 2. A random sample of 51 charge sales showed a sample standard deviation of $47. A 90% confidence interval estimate

In addition to the solutions for the problem set if possible, could you also include the excel spreadsheet? Thank you

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The width of a confidence interval depends on the size of the: population mean margin of error sample mean none of these

At a factory that produces pistons for cars, Machine 1 produced 174satisfactory pistons and 116unsatisfactory pistons today. Machine 2 produced180 satisfactory pistons and 20unsatisfactory pistons today. Suppose that one piston from Machine 1 and one piston from Machine 2 are chosen at random from today's batch. What is the probability that the

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A winch at the top of a 12-meter building pulls a pipe of the same length to a vertical position. The winch pulls in rope at a rate of - 0.2 meter persecond. Find the rate of vertical change and the rate of horizontal change at the end of the pipe when y = 6.

which measure of central tendency is most affected by outliners and WHY

Coffee Exports Country Venezuela Sri_Lanka Nigeria Philippines Togo Paraguay Sierra_Leone Ghana Jamaica Angola Zimbabwe Zambia Dominican_Republic Rwanda Bolivia Haiti Guinea Malawi Central_African_Republic Cameroon Panama Cuba Congo Thailand Madagascar Burundi Papua_New_Guinea Ecuador Nicaragua Ethiopia Kenya Tanzania El_Salvador Costa_Rica India

If a null hypothesis about a population proportion p is rejected at the 0.025 level of significance, then it must also be rejected it at the 0.05 level. True or False

\fID Salary Compa Midpoint Age 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 60 26.8 34.7 57.9 48.5 74.3 42 23.6 74.2 22.6 23.4 61.7 41.3 22.9 24.9 46.6 66.5 36.3 24.5 34.3 76.7 57.3 22.5 54.7 24.5 23 39.4 75.4 72 46 24 26.9 59.8 26.5 22.6 23.4 23.3 65.4 1.053 57 31 31 57 48 67 40 23 67 23

A model train engine was moving at a constant speed on a straight horizontal track. As the engine moved along, a marble was fired into the air by a spring in theengine's smokestack. The marble, which continued to move with the same forward speed as the engine, rejoined the engine 1 sec after it was fired. The measure of the angle the marble's path

Tree-ring dates were used extensively in archaeological studies at Burnt Mesa Pueblo. At one site on the mesa, tree-ring dates (for many samples) gave a mean date of 1 = year1269with standard deviation 1 =39years. At a second, removed site, the tree-ring dates gave a mean of 2 = year1104with standard deviation 2 =36years. Assume that both sites

1. (Section 2.2, Problem 46) 2. (Section 2.2, Problem 64) 3. (Section 2.3, Problem 4) 4. (Section 2.3, Problem 10) 5. (Section 2.3, Problem 12) 6. (Section 2.3, Problem 18) 7. (Section 2.3, Problem 22) 8. (Section 2.3, Problem 30) 9. (Section 2.3, Problem 36) 10. (Section 2.3, Problem 38) 11. (Section 2.3, Problem 66) 12. (Section 2.4, Problem 6)

a die is thrown once. determine the probability of getting a 6 if the die is thrown once.

The local independent party wants to poll registered voters to see the proportion who would consider voting for an independent candidate. They have asked you to tell them how many voters they need to survey to get a 90% confidence level that the true population proportion is within a 0.02 margin of error. How many people do they need to survey to

Assume a symmetric distribution with mean 77, and SD=15. Identify if each of the following are outliers or not: a. 102 b. 125 c. 87 d. 12

#10 1. We predict that while listening to classical music, students asked to complete mental tasks will complete more tasks than will students listening to rock music. We recruited 30 students into our study. Fifteen students were asked to complete mental tasks while listening to classical music. Their mean number of tasks completed was 23.13 and

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Calculate the incidence rate: 4,875 healthy people are tracked over a two-year period. Over that two-year period, 75 of those people develop a particular disease. Determine the incidence rate of disease over the study period? Show all your work. Incidence rate = Incidence density = no. of disease onsets Sum of person-time @ risk

While working for Life magazine, Archie is assigned to the Galapagos Islands to photograph a rare, giant white turtle. The turtle can be found either on Isabella, the largest of the 16 Galapagos islands, or on Santa Cruz, the next largest island. Many have tried to locate the giant turtle, but 79% of them have failed. In addition, out of every

Consider the formula used for any confidence interval and the elements included in that formula. What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the margin of error? Only consider one of these changes at a time. Explain your answer with words and by referencing the

A candy company developed a new consumer product that is expected to earn $5 comma 0005,000 in profit each year if consumer demand is low, $20 comma 00020,000 per year if consumer demand is moderate, and $35 comma 00035,000 per year if consumer demand is high. The probability of low, moderate, and high demand is 3535%, 4545%, and 2020%,

Suppose you encounter two traffic lights on your commute to school. You estimate that the probability is .5 that the first light will be red when you get to it, .4 that the second light will be red, and .6 that at least one of the lights will be red. a) Determine the probability that both lights will be red. b) Consider the random variable, which

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Respond to the following to describe a scenario where a researcher might use a Goodness of Fit Test, a Test for Independence, or an Analysis of Variance to investigate a research question. 1. Provide an overview of the scenario and an explanation of why the selected statistical test is appropriate. 2. Provide brief descriptions of the variables

A hospital administrator is concerned about the waiting times for patients in the emergency room. She records the waiting times (in minutes) of a random sample of 32 patients, which areshown below: 133 263 99 192 401 318 202 120 136 195 167 237 89 238 186 137 256 172 333 210 158 74 165 321 219 124 203 371 136 160 81 192 From these data, the sample

The following data give the weights (in pounds) lost by 15 members of a health club at the end of 2 months after joining the club. 4 23 9 18 12 4 9 13 12 16 7 4 7 16 14 a.Compute the values of the three quartiles and the interquartile range. Q1 Q2 Q3 IQR b.Calculate the approximate value of the82ndpercentile. Enter an exact value. c.Find the

2. Solve the following linearprogramming model graphically. In addition, write the problem in standard formand do a constraint analysis for the optimal solution. Maximize14x + 20y Subjectto x + 2y < 20 x + y < 15 x > 8 x, y 0

This is a comprehensive final essay. Create a scenario based on your work, school, home or other place and describe how you could use the knowledge and skills you've developed in the class to help answer a question or solve a problem. In a minimum of 500 words create a scenario using appropriate formatting and verbiage for a college-level paper.

find the percent of the total area under the curve between z= -2.49 and z= 1.19

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From a group of four men and six women, a committee of four is to be chosen. Demonstrate your understanding of this discrete probability distribution by determining the probability that a randomly selected committee consists of exactly two men and two women?

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