A research shows that the average time an adult spends on social media is 27 hours a week. A surveyconsisting of 20 randomly selected teenagers were asked of their average time spent on social media aweek to prove a claim that these teenagers actually spend time more than adults. It was found that theteenagers' average time is 30 hours with a standard deviation of 3.47 hours. Test the claim that teenagersspend more hours on social media than adults at 5% alpha level.What kind of test will we use (z or t)? Blank 1Is this a one-tailed or two-tailed test? Blank 2What is the test statistic? Blank 3Accept or Reject the null hypothesis? Blank 4For numerical input, round off your answer to TWO (2) decimal places.Blank 1 Add your answerBlank 2 Add your answerBlank 3Add your answerBlank 4Add your answer

In order to determine whether the teenagers spend more hours on social media than adults, conduct a…

Answered: A research shows that the average time…

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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The average age of Americans is 72 years. A group of 25 individuals participated in a new diet program to see if it increased their lifespan. The group was evaluated a few decades later to see if the program made the subjects live longer. The mean age for the new diet group was 79 years with a standard deviation of 6.5. If a t-test was conducted, would this be a one-tailed (directional) or two-tailed (non-directional) hypothesis? Group of answer choices
A sample of 200 corporate managers produced the mean job-related stress score of 7.9 with a standard deviation of .65. Another sample of 300 college professors produced the mean job-related stress score of 5.4 with a standard deviation of .90. The null hypothesis is that the mean job-related stress score for all corporate managers is equal to the mean job-related stress score for all college professors. The alternative hypothesis is that the mean job-related stress score for all corporate managers is not equal to the mean job-related stress score for all college professors. The significance level is 1%. What are the critical values of z? a. –2.33 and 2.33 b. –2.17 and 2.17 c. –1.96 and 1.96 d. –2.58 and 2.58
Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age 45. The impact of exercise may increase BMD. A random sample of 59 women between the ages of 41 and 45 with no major health problems were studied. The women were classified into one of two groups based upon their level of exercise activity: walking women and sedentary women. The 39 women who walked regularly had a mean BMD of 5.96 with a standard deviation of 1.22. The 20 women who are sedentary had a mean BMD of 4.41 with a standard deviation of 1.02. Which of the following inference procedures could be used to estimate the difference in the mean BMD for these two types of women
Researchers are trying to determine if there is a difference in the average lifespan of two species of fruit fly: Ceratitis capitata and Drosophila melanogaster. They measure the lifespans of two random samples of each species. The SRS of Ceratitis capitata was of size 105 and had an average lifespan of 51 days with a standard deviation of 7 days. The SRS of Drosophila melanogaster was of size 95 and had an average lifespan of 48 days with a standard deviation of 6 days.
According to a Stanford Business article, Americans may eat fewer calories at restaurants if the calories of the food items are labeled on the menu. To investigate this, researchers compared Starbucks receipts from locations where the menus were labeled to receipts from stores where the menus were not labeled. A random sample of 30 receipts from stores with the menus labeled had an average number of calories of 225 calories with a standard deviation of 100 calories. A random sample of 40 receipts from stores without menus labeled showed an average of 265 calories per receipt with a standard deviation of 75 calories. Does this provide convincing evidence that the average calories per receipt at Starbucks with a labeled menu is less than at a Starbucks without labeled menus? Assume all conditions for inference have been met. Perform a significance test at the α=.05 significance level.
A professional racing team is holding tryouts at its test track. The team requires its drivers to have an average lap time of at most 133 seconds at its test track. The team will use a one sample z-test of significance to determine if they should hire a new driver. An amateur driver completes 8 timed laps of the test track with an average lap time of 136 seconds. If the standard deviation of all lap times at this track is 4.1 seconds, what is the value of the test statistic? Round your answer to two decimal places.

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