tion 13 of 16 >Researchers asked the students in a large first-year college class how many minutes they studied on a typical weeknight. Theback-to-back stemplot displays the responses from random samples of 30 women and 30 men from the class, rounded to thenearest 10 minutes.Women| MenWhich of the following are correct comparisons of the0333356668999022222225580034429622222222888888888875555distributions of study time for men and for women.I. Both distributions have similar shapes.II. Both distributions have similar variability.14440III. Both distributions have similar medians.O I onlyOI and II only6.O I, I and IIIOI and III onlyO II onlyKey: 23 = 230 minutes

Answered: Image /qna-images/answer/3ac36afe-f206-4256-b36b-9e3f70d5e831.jpg

Answered: tion 13 of 16 > Researchers asked the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An automobile manufacturer wishes to compare the lifetimes of two brands of tire. She obtains samples of seven tires of each brand. On each of seven cars, she mounts one tire of each brand on each front wheel. The cars are driven until only 20% of the original tread remains. The distances, in miles, for each tire are presented in the following table. Can you conclude that there is a difference between the mean lifetimes of the two brands of tire? Car Brand 1 Brand 2 36,925 34,318 2 45,300 42,280 3 36,240 35,500 4 32,100 31,950 37,210 38,015 48,360 47,800 38,200 33,215 State the appropriate null and alternate hypotheses. b. Compute the value of the test statistic. Find the P-value and state your conclusion. a. C.
random sample of 20 daily workersearning average daily wage of 44 with a sample variance 900.another 20 workers with average daily wage of 30 with sample variance 400.test which workers are earning more
A Pupillometer is a device used to observe changes in an individual’s pupil dilations as he or she is exposed different visual stimuli. A Research Laboratory used a pupillometer to evaluate consumer reaction to different silverware patterns for one of its client companies. Suppose 15 consumers were chosen, and each was shown two different silverware patterns. The pupil dilation for each pattern shown was measured and their difference was computed. The sample mean of the differences in pupil dilation per consumer between silverware patterns 1 and 2 was 0.2393 mm and the sample standard deviation of the differences was 0.1608 mm. (a) Construct a 90% confidence interval to estimate the true difference in mean pupil dilation per consumer for silverware patterns 1 and 2 in the population. (b) What assumptions are required for the confidence interval of part (a) to be statistically valid?
In a large city, researchers selected a random sample of 120 individuals who have multiple televisions in their house connected to a streaming device. Each individual was asked how many hours of streaming content they watch in a typical week. The sample had a mean of 12.5 hours. For which of the following populations is 12.5 hours a reasonable estimate of the mean hours of weekly streaming content watched? (A) All individuals who regularly watch streaming content (B) All individuals from this city who regularly watch streaming content (C) All individuals from this city with multiple streaming devices in their house (D) All individuals from this city with multiple streaming devices in their house who regularly watch streaming content (E) All 120 individuals in this city with multiple streaming devices in their home who regularly watch streaming content
Suppose the total weight of passengers and luggage on an airline flight is normally distributed with mean 8914 and standard deviation 32 What is the 2.28th percentile of total passenger weight
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Please answer the last three parts of this question.
3) Last year, the mean running time for a certain type of flash light battery was 8.5 hours. This year, the manufacturer has introduced a change in the production method which he hopes will change the mean running time. A random sample of 40 of the new light bulbs was obtained and the mean running time was found to be 8.7 hours. Do the data provide sufficient evidence to conclude that the mean running time of the new light bulbs is different from last year's mean of 8.5 hours? Perform the appropriate hypothesis test using a significance level of 0.05. Assume that standard deviation of running time of all new light bulb batteries of this type is 0.5 hours.
When does Two Related Samples occur?
In college, talented runners may join a cross-country team. Runners tend to run their best times when they run even splits. Even splits occur when the runners maintain an even pace throughout the race. The cross-country coach wants to estimate the typical variability in his best runner's 1-mile splits. He takes a random sample of 25 of this runner's mile splits and finds that this runner's mean 1-mile split is 5.44 minutes per mile, with a standard deviation of 0.14 minutes per mile. This runner's 1-mile splits follow a normal distribution. (a) Find the chi-square critical values XL² and Xu² to be used in constructing a 95% confidence interval for the true population standard deviation. (Round your answers to two decimal places.) XL²= XU²= (b) Find the 95% confidence interval for the true variability in his best runner's 1-mile splits. (Round your answers to three decimal places.) lower bound and the upper bound
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Suppose we have a balanced one-way ANOVA, with 10 observations in each of 4 groups. The total sum of squares was found to be 2000. The sum of squares due to error (AKA residual) was found to be 900. What is the value of the one-way ANOVA F test statistic? (Give your numeric response to at least 3 decimal places. Give only the numeric response, and not any extra characters or symbols.)

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