Mathematics Questions and Answers September 30, 2020

1 A perimeter and area of each trapezoid Round to nearest tenths Drawings are not to scale 17 in 21 in 16 in 20 in 38 in 2 24 3 cm 8 5cm 9 cm 8 5 cm 9 7 cm 14 4 cm P

GradeResulls Question 9 O 1 How many lines of symmetry are there in the figure given below O2 Points 1 O 3 0 My Activities Tell me what you

Find the mean for the following list of salaries 30 500 24 000 33 620 29 710 24 900 28 050 27 600 32 980 The mean is Typo on integer or a decimal

0 The percentage grade of a road measures the change in the altitude of a road in comparison with the horizontal distance covered by the road For example a 5 grade means that the road rises 5 feet for every 100 feet of horizontal distance Ms Palmer is about to turn onto a mountain road and sees this sign What angle does the road make with the

At the beginning of the lesson Jacob determined that there was a problem with the sail length measurements of 7 5 meters 4 8 meters and 2 5 meters Explain how Jacob was able to determine there was a problem with the specifications of the triangular sail BIUX X 15px V AVV

15 Rotate the figure 90 clockwise about the origin 19 Rule x y 6 mwoll ayana Tung bongo astsupa DE CE bias te

Q 8 Mon Jul 25 2:45 PM Bookmarks Window Help G ezto.mheducation.com JUL Anniversary Tomorrow 26 Tomorrow M Question 4 - 5-3 Homework: Chapter 6 (Sections 6.1 through 6.4) - Connect 5-3 Homework: Chapter 6 (Sections 6.1 thro... i Submitted 39.17/50 Total points awarded Help Exit * You received no credit for this question in the previous attempt.

7a You are a business analyst for Northrop Grumman and are using the following data and regression to analyze the relationship between production volume of a radio part and total production cost. Your research question is: "How does production volume affect total cost?" Production Volume (units) Total Cost ($) 100 1727 200 2682 300 3719 400 4623

Phuong and her friends attend a music festival, with a mix of rock and dance music. There are 22 friends altogether (including Phuong) and their attendance is as follows: . 13 attend the rock music 11 attend the dance music 4 attend both The values a, b and c represent the number of friends. rock dance a. Find the values of a, b and c. (3 marks) a

Exercise 3 (10 Points) Consider the hypothesis test Ho : pl = p; against H1: p1> m with known variances 01 = 10 and 02 = 5. Suppose that sample sizes m = 10 and n; = 15 and that 3E1: 24.5 and f2 = 21.3. Use a = 0.01. (a) Test the hypothesis and find the P-value. (b) Explain how the test could be conducted with a confidence interval

A researcher is interested in understanding whether the mean time to complete a four-year college degree varies based on gender. She draws a sample of 12 college graduates6 men and 6 women, and asks them how many years they took to finish their degree. Assuming that the data are drawn from a normal distribution, test the null hypothesis of no

LubeCar specializes in fast automobile oil change. The garage buys car oil in bulk at $3 per gallon. A price discount of $2.50 per gallon for the entire order is available if LubCar purchases more than [000 gallons. The garage services [50 cars per day and each oil change requires 1.25 gallons. LubeCar stored bulk oil at the cost of $0.02 per

Roll a fair die repeatedly; _\\ represents the number of rolls it takes to get a six. X is binomial with n = and p- Click to view explanation Check

Question 4 20 points Save Answe An investment advisory service occasionally mails out large amount of promotional materials. Among other things, this activity calls for folding descriptive brochures and inserting them in pre- addressed envelopes. A time study was made of one of the employees engaged in this operation. The employee was observed for

reg salary years . reg salary years Source SS df MS Number of obs = 353 F (1, 351) 104.03 Model 1. 5940e+14 1 1.5940e+14 Prob > F 0.0000 Residual 5. 3779e+14 351 1.5322e+12 R - squared 0. 2286 Adj R-squared 0. 2264 Total 6.9718e+14 352 1.9806e+12 Root MSE 1. 2e+06 salary Coefficient Std. err. t P> t [95% conf. interval] years 173428.6 17003.3 10.

Score on last try: 0.5 of 1 pts. See Details for more. > Next question Get a similar question You can retry this question below A newsgroup is interested in constructing a 90% confidence interval for the proportion of all Americans who are in favor of a new Green initiative. Of the 565 randomly selected Americans surveyed, 439 were in favor of the

If normal random variable from a normally distributed population with mean 21 and standard deviation 4, is 15. The value of standard normal random variable will be ____________" a) -1.5 b) 5 c) 2.4 d) -2.4

Please help on 11 Question 11 0/1 pt 9 10 99 0 Details Ramp metering is a traffic engineering idea that requires cars entering a freeway to stop for a certain period of time before joining the traffic flow. The theory is that ramp metering controls the number of cars on the freeway and the number of cars accessing the freeway, resulting in a freer

iii) [8 marks] Consider the system of hypotheses: H0 : A = A0 vs H1 : A 75 A0, where A0 = 75. Analytically compute the Bayes Factor Bel. Suppose the mean for the next 10 year is 37 = 57. What would be the preferred hypothesis using the Bayes Factor

Part 1 of 5 An automotive maker researcher wants to compare the effect of two fuel additives on the average gas mileage of the new car model. The fuel consumption {in miles per gallon) was recorded for 22 cars running for 1 week using the first additive, and then the average miles per gallon were recorded for 19 cars running for 1 week using the

1.According to a published study, 1 in every 7 men has been involved in a minor traffic accident. Suppose we have randomly and independently sampled twenty-five men and asked each whether he has been involved in a minor traffic accident. How many of the 25 men do we expect to have never been involved in a minor traffic accident?

Please help 4. From past experience, it is known 90% of one-year-old children can distinguish their mother's voice from the voice of a similar sounding female. A random sample of 20 one-year-olds is given this voice recognition test. [8 marks] (Round your answers to three decimal places if necessary.) a) Find the probability at least 3 children do

Question 25 4 pts The managers are considering a new training program that has the potential to improve the the customer's satisfaction (0-10 scale} with the service provided. The efcacy of the training could best be studied by: O Implementing a survey of the agents to see how useful they found the training. 0 Conducting a comparison of resolution

using dataset from https://data.world/govex/resistance-response-training how can I find these answers using excel ONLY please step by step 1. How many unique police officers are represented in this data set? a. 3,744 b. 3,474 . 4,347 d. 3,475 2. How many of those officers have had at least one violent response to resistance? a. 1,027 or 30% b.

10:05 education.wiley.com Homework 3 4 of 8 - / 1 . . . WIN - Current Attempt in Progress Solve for the mean and standard deviation of the following binomial distributions. a. n = 20 and p = 0.70 b. n = 70 and p = 0.35 c. n = 100 and p = 0.50 (Round the intermediate values to 2 decimal places, e.g. 0.21. Round your answers to 2 decimal places,

A group of activists wants to verify the claim that in a certain Fortune 500 company the average salary of female employees is different from the average salary of male employees. Two samples of male and female workers were obtained independently and analyzed. Females (in thousands of dollars): (Note: The average and the standard deviation of the

Calculate the negative predictive value. Disease No disease Positive 20 33 Negative 10 37 O a. 0.38 O b. 0.67 O c. 0.79 O d. 0.53 Calculate the positive predictive value. Disease No disease Positive 20 33 Negative 10 37 O a. 0.38 O b. 0.67 O c. 0.79 O d. 0.53 Calculate the odds ratio for the following table: Developed Covid Yes No Vaccinated 100

What is a real-world example of the use of standard deviation and normal distribution

Sophia who took the Graduate Record Examination (GRE) scored 160 on the Verbal Reasoning section and 157 on the Quantitative Reasoning section. The mean score for the Verbal Reason- ing section for all test takers was 151 with a standard deviation of 7, and the mean score for the Quantitative Reasoning was 153 with a standard of 7.67. Suppose the

jenna from denver starts a new high-speed internet service for luxury apartment buildings. The company, Spee-today, reports that 33% of its customers subscribe to its streaming television service, 42% subscribe to its internet service, and 22% subscribe to both services. In this problem, let A be the variable for the event that someone has

The graph shows the results of a survey of adults in Country A, ages 33 to 51, who were asked if they participated in a sport. Seventy percent of adults said they regularly participated in at least one sport, and they gave their favorite sport. You randomly select 300 people in Country A, ages 33 to 51, and ask them if they regularly participate

Help with these question IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one individual is randomly chosen. Find the probability that this person has an IQ greater than 92. Round your answer to 4 decimals. P(IQ greater than 92) = WORK REQUIRED (at least the setup, and any calculator / software inputs)Assume

Please Solve Seventeen percent of U.S. residents are in their twenties. Consider a group of six U.S. residents selected at random. Find the probability that three or four of the people in the group are in their twenties. The probability that three or four of the people in the group are in their twenties is (Round to four decimal places as needed.)

QUESTION 1 A randomly select group of subjects is involved in a study, and each subject was observed twice, before and after a treatment to see if there is any difference in their heart performance rates due to this treatment. The data is listed in the table below. Subject Before After 1 3.5 4.0 2.8 3.1 3.2 3.3 2.9 3.0 VOUAWN 3.3 3.7 3.1 3.2 2.8

An instructor has given a short quiz consisting of two parts. For a randomly selected student, let X = the number of points earned on the first part and Y = the number of points earned on the second part. Suppose that the joint pmf of X and Y is given in the accompanying table. y P( X, y) 5 10 15 0 0.03 0.06 0.02 0. 10 X 5 0.04 0.17 0.20 0.10 10

Your local grocery store sells 1 lb. bags of potatoes. However, the 1 lb. bags do not weigh exactly 1 lb. If we let be the weight of a randomly selected 1 lb. bag of potatoes, historical data indicates that ~(1.02, 0.13). Local cash and carry store sells 5 lb. bags of potatoes, which also do not weigh precisely 5 lbs. If Y is the weight of a

A survey asks "would you like to see more or less government spending on natural disasters?" Of the 1496 respondents, 723 responded "more" or "much more". The proportion of respondents who responded "more" or "much more" is an example of Select one: O A. a parameter O B. the population O C. random sampling O D. the sample O E. a statistic Clear my

Can you help explain the question and how to go about solving it? Thanks ahead of time Find an equation of the line tangent to the graph of f the given point. f(x)=tan -1 (2x) point (1/2, pi/4)

Birth control pills have a theoretical annual efficacy of 99.5%, but a real world efficacy of only 95%. if a college student takes the pill for the four years she is in college, what is the probability that she will become pregnant at least once using the real-world efficacy rate? A. 0 B. 0.005 C. 0.019 D. 0.185

A manufacturer produces metal bars measuring 15 cm using equipment that sometimes malfunctions, causing nicks at various locations on the surface of a bar. Most bars with a nick are defective and must be scrapped. However, if the nick occurs so that the bar can be shortened to 12 cm, the bar can still be sold at the shorter length. Assume that the

6. Francis invested Php200,000 pesos in a government bond that pays 3.5% per year for 4 years. How much interest is earned per month

perform worse on the cognitive task after sleep deprivation (a = 05). This data is below: 8 hours sleep 4 hours sleep 12 10 10 9 15 14 12 8 8 7 9 8 s = 2.53 S= 2.5 D = 10 D2 = 24 What is the observed t for this analysis (absolute value)? pport .Moving to another question will save this response

Use the properties of logarithms to rewrite the logarithm below. Assume that all variables represent positive real numbers. 417 log 4 50 417 109 4 5u (Type an exact answer in simplified form.)

Solve the equation. log 4 (x + 7) =2 X= (Type an integer or a decimal.)

Solve the equation log 487) 2 x (Type an integer or a decimal.)

Question 8 5 p A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n = 1006 and x = 586 who said "yes." Use a 95% confidence level. Find the best point estimate of the population proportion p. A. 0.461 O B. 0.583 OC. 1.717 O D. 0.507

what are the underlying assumption of multiple regression and what can be done if assumption are not met?

3.6. For i = 1, . .., n, let {X,(t); t 2 0) be independent Poisson processes, each with the same parameter A. Find the distribution of the first time that at least one event has occurred in every process

In a randomized controlled trial in Kenya, insecticide treated bednetswere tested as a way to reduce malaria. Among 343 infants using bednets, 15 developed malaria. Among 294 infants not using bednets, 27 developed malaria. Want to use a 0.01 significance level to test the claim that the incidence of malaria is lower for infants using bednets.

All continuous functions have limits. O True O False

All continuous functions have limits. True C) False

3: Let T, have a t - distribution with n degrees of freedom, n + 1 n = 1,2, ... FO= 2 r(In)r 1+1 dx NE X2 2 + Find limiting distribution of T, by D F method

Assigned Media Qu The boxplots show data for state and local community expenditures on hospitals and highways. Hospitals Estimate Q1, Q2, and Q3 for hospital and highway spending. Highways 0 2 3 4 5 6 Billions of Dollars Q, for hospital spending is 1.4 (Round to one decimal place as needed.)

Let the null model be that the true capacity is mu_0=5000 milliampere hours (mAh) and that measurements are Normally distributed around this with standard deviation equal to sigma=500 mAh . Let the actual capacity be mu_1=5300 mAh. Suppose you make n independent measurements, calculate the Z-statistic, and perform a 1-sided Z-test of the null

Suponga que las puntuaciones del CI tienen una media de 100 y una desviacin estndar de 15 si no sabe que tipo de distribucin sigue el coeficiente intelectual Que porcentaje est estre 55 y 145 ?

All functions have limits that exist. O True O False

All functions have limits that exist. C) True False

Atenolol is a beta block used to lower heart rate, and in turn lower systolic blood pressure. you are conducting research on atenolol to see if it really does lower the heart rate of your patients. a sample of 19 patients was taken and you took their heart rate before and after 2 week of being on atenolol. assuming you subtracted the before HR

Let ZZ denote the random variable with the standard normal distribution. Find P (2.06 Z 2.31) Give your answer as a decimal, rounded to four decimal places.

Suppose (X; Y ) is a continuous random vector with joint probability density function fx, y( x, V ) = y OsX$2, 0sys1 Lo else Then P(1

According to the National Association of Realtors, it took an average of three weeks to sell a home in2017. Data for the sale of40randomly selected homes sold in Greene County, Ohio, in2017showed a sample mean of3.6weeks with a sample standard deviation of2weeks. Conduct a hypothesis test to determine whether the number of weeks until a house sold

1.If you had Php 1,000,000.00 to spend, what would you do with the money? a)Construct a frequency distribution of what you would do with the money. Describe the result. b)Construct a bar chart or a pie chart to display the data. Explain why your choice of graph is more appropriate to portray this data.

Using the Z tables, what percent of the data is within 2 standard deviations from the mean? Group of answer choices. What is it? a. 0.9772 b. 0.9500 c. 0.9544

An observational study was conducted to find out if eating whole-wheat products was associated with a reduction in body mass index (BMI) for children. The measure of interest was the difference between population mean BMI for children who eat whole-wheat products and children who don't. a) What are the null and alternative hypotheses for this

Assume that for the population of all unemployed individuals the population mean length of unemployment is 32 weeks and that the population standard deviation is 2.1 weeks. Suppose you would like to select a random sample of 100 unemployed individuals for a follow-up study. Find the probability that the mean of this sample of size is more than

Given a standardized normal distribution,what is the probability that Z is greater than 1.62? What is the answer? a. 0.9474 b. 0.0526 c. 0.0548

Which of the following numbers are possible F Statistics? Select all that apply. Question 16 options: 2 -7.28 0.0834 3.61

For each of the following find the population, sample, statistic, and parameter , if possible. The Gallop Poll interviewed 1425 randomly selected American citizens in Sept 2000 and reported that when asked which type of content bothered them most on TV 43% identified violence. Population: Sample: Sample Statistic: Population Parameter :

D Question 2 4 pts Adult male heights have a normal probability distribution with a mean of 70 inches and a standard deviation of 4 inches. What is the probability that a randomly selected male is more than 74 inches tall? Enter you answer in decimal form, e.g. 0.68, not 68 or 68%. D Question 3 4 pts

List 5 types of functions that are continuous at every number in their domain.

Here is your summary table for this research: SS df MS Sig Between ?? 2 8.46 ?? 02 Within 180.76 ?? ?? Total ?? 102 Calculate the appropriate effect size for this analysis? Moving to another question will save this response

1. The data shows the fuel economy, in miles per gallon, of the cars owned by a rental car company. 26, 32, 18, 47, 16, 24, 33, 17, 34, 27, 24, 36, 23, 26, 19, 22, 21, 20, 35, 28, 29, 43, 23, 33 (a) Create frequency table using class widths of 5. (b) Create frequency histogram using bin widths of 5. (c) Describe the shape of the distribution.

3. Evaluate the derivatives below. a. ) cosh (t2 In t) dt d b. ) In(x12 - 10g2 x) dx

Suppose x is a uniform random variable with c = 20 and d = 50. Find P(23 < x < 45). Round to the nearest hundredth when necessary.

Which of the following functions have a graph that does not have a vertical asymptote? Select all that apply. 3x + 1 A. f(x) = X - 6 O B. f(X) = x- +3 3 O c. f(x) = 2 D. f(x) = 2 - 3

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 10.3 years, and standard deviation of 2.1 years. If you randomly purchase one item, what is the probability it will last longer than 10 years? Round your answer to at least three decimals. In the box below, type in what you entered into the calculator to get

E B = E Zi( xi - x) yi Ei (xi - X) . E(yi) E. (xi - x) 2 since the xis are known Ci (xi - 8)2 Ei (xi - X) . E (Bo + Bixi) (xi - X) = ( xi - x)2 ci (Bo + Bixi) , where c = E. ( x - 8) 2 = Bo [ cit BI _ cixi = B1 where the last result is true since _, c; = 0, and _, cix; = 1

The average time it takes to take a stats test is 1.13 hours. I wish to test to see if the last 8 exams had a time that was different from normal. The average time to do the 8 exams was 1.2 hours with a standard deviation of .4 hours. a) At the .05 level did the last exams take times that were of different length (p = .64) b) Interpret the p-value

For the following dataset, you are interested to determine the "spread" of the data. Would you employ calculations for the sample standard deviation, or population standard deviation for this dataset: Ages of all students in a Statistics course with an enrollment of 30 students

1.Which of the following graphical methods can help you judge the normality assumptions of your data? A.Stem and leaf B.Histogram C.Box and Whiskers plot D.All of the above 2.True or False: A bimodal distribution can be considered a standard normal distribution.

You conduct a 1-way ANOVA with 8 groups. You find a statistically significant effect. How many possible pairwise comparisons could be conduct with this data? Number of pairwise comparisons: Submit

Given the following actual and forecast data. Compute MAPE (MARD) in Period 5. MAPE= MARD=AVERAGE(abs(A-F)/A). Do NOT multiply by 100. ROUND your answer to TWO decimal point. t At Ft 1 186 199 2 151 98 3 145 221 4 107 58 5 140 226 Answer: ?

Find the area of the shaded region given z=-1 , 32 and z=0.9 the shaded region give a.132 and 2 -09

Television viewers often express doubts about the validity of certain commercials. In an attempt to answer their critics, a large advertiser wants to estimate the true proportion of consumers who believe what is shown in commercials. Preliminary studies indicate that about 40% of those surveyed believe what is shown in commercials. What is the

296 3.2. The joint probability density function for the waiting times W, and W2 is given by f(w,, w2) = 13 exp{-Aw2) for 0

A farmer believes that the average pumpkin from his crop weighs at least 7 pounds. To test his claim, he selects 15 pumpkins randomly and weighs them. The weights (in pounds) are listed below. 4.8 7.8 5.9 10.1 7.2 8.1 6.0 9.3 6.7 4.3 8.3 6.9 10.0 9.2 6.8 The sample statistics are: = 7.43, = 1.77 Can the farmer infer, at the 5% significance level,

Suppose x is a random variable best described by a uniform probability distribution withc=10and d=50 FindP(40 <5x <50) should be greater than or equal to signs

3.5. Let X(t) be a Poisson process of rate 0 per hour. Find the conditional probability that there were m events in the first t hours, given that there were n events in the first T hours. Assume 0 S m S n and 0

What is the one-sample chi-square test (goodness-of-fit) and when would you use it?Take one more non-parametric test and explain its function and use.

List 5 types of functions that are continuous at every number in their domain.

Mrs. Gallas was an all-star basketball player in high school. To prove that she still has skills, she took 50 free throws and made 31 of them. Think of these 50 shots as being a random sample of all the free throws she has ever taken. Find a 99% confidence interval for the true proportion of free throws Mrs. Gallas would make.

Consider the following hypothesis test: H0: 12 Ha: > 12 A sample of25provided a sample meanof 14 and a sample standard deviations=432. a. Compute the value of the test statistic (to2decimals).

5.(6 pts) How large a sample size we need to estimate p with margin of error 0.02 with 95% confidence

What would you say are the two most important topics that you can take away from the course to apply in future studies or your career.

Use implicit differentiation to find and ay 2 v2 + 22 - 82 = 2 ay

Use implicit differentiation to find and ax By x2 Y2 22 8z 2

choose a problem in your community that you can use the process of hypothesis testing. Make a scenario out of it using all the data needed in hypothesis testing then cite your claim about this problem. Use samples that are less than 30. Lastly test your claim if it is true. Show your step by step process in conducting hypothesis testing. please

Use el nivel de confianza dadoy los datos de la muestra para construir un intervalo de confianza para la proporcin poblacional p. n = 125, x = 72; confianza del 90% 0.507

A survey of college students shows that 60% own a laptop, 80% own an iPod and 50% own both. a) what percent own either a laptop or an iPod (or both) b) what percent own neither a laptop nor an iPod.

Question 7: (Normal curve) A person having Diabetes, tests his blood sugar 3 times each day. His test results of the last 3 months are a normal distribution with mean 120 and Standard Deviation 30. He is planning to test his blood sugar now. What is the probability that this reading will be above 150 or below 90

Question 21 Please round all answers to 2 decimal places. Given the table below, use your calculator to find the Correlation Coefficien 2.2 4.7 8.4 4.5 9.4 5.1 y 5.7 18.9 24.8 12.3 21 17.6 Put your answer here: Question Help: Video Message instructor Submit Question se

QUESTION 12 One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month. It was revealed that they watched an average of 161 hours each month with a standard deviation of 37 hours. Assume that the underlying population distribution is normal. Calculate the EBMUse a 99 Confidence Level Round

Complete the following ANOVA summary table by filling in the missing information. Do we accept or reject the null at p=.05? Source df SS MS F Between 80 20 Within Total 29 180

instructed to sleep the amount of hours assigned for their group for two consecutive nights. Afte Here is your summary table for this research: SS df MS F Sig Between ?? 2 8.46 ?? .02 Within 180.76 ?? ?? Total ?? 102 What is the value of F? .. Moving to another question will save this response