A director of student success wants to test whether currently enrolled students study more than 3 hours per day on average. A random sample of25 students has a mean study time of 3.32 hours with a sample standard deviation of 0.80 hour. At a = 0.05, does this sample provideconvincing evidence that students study more than 3 hours per day on average? Assume that study time is normally distributed.Ho: μ ≥ 3.32 Ha: μ<3.32. Test statistic t = -2.00. Rejection region: t > 1.711. Do not reject Ho. There is not sufficient evidence to concludethat students study more than 3 hours per day on average.Ho: μ≤3 Ha: μ> 3. Test statistic t = 2.00. Rejection region: t > 1.711. Reject Ho. There is sufficient evidence to conclude that studentsstudy more than 3 hours per day on average.Ho: μ ≥ 3 H₂: μ<3. Test statistic t = -2.00. Rejection region: t < -1.711. Reject Ho. There is sufficient evidence to conclude that studentsstudy more than 3 hours per day on average.Ho: u≤3.32 Ha: μ> 3.32. Test statistic t = 2.00. Rejection region: t < -1.711. Do not reject Ho. There is not sufficient evidence to concludethat students study more than 3 hours per day on average.Ho: μ ≥3 H₂: μ< 3. Test statistic t = -2.00. Rejection region: t < -1.711. Do not reject Ho. There is not sufficient evidence to conclude thatstudents study more than 3 hours per day on average.Ho: μ≤ 3 H₂: μ> 3. Test statistic t = 2.00. Rejection region: t > 1.711. Do not reject Ho. There is not sufficient evidence to conclude thatstudents study more than 3 hours per day on average.

Let μ be the mean no. of hours per day. Population mean (μ)=3 hours per day Sample size (n) = 25…

Answered: A director of student success wants to…

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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Dean Halverson recently read that full-time college students study 20 hours each week. She decides to do a study at her university to see if there is evidence that students study an average of less than 20 hours each week. A random sample of 30 students were asked to keep a diary of their activities over a period of several weeks. It was found that he average number of hours that the 30 students studied each week was 18.7 hours. The sample standard deviation of 3.4 hours. Find the p-value. The p-value should be rounded to 4-decimal places.
Fran is training for her first marathon, and she wants to know if there is a significant difference between the mean number of miles run each week by group runners and individual runners who are training for marathons. She interviews 42 randomly selected people who train in groups and finds that they run a mean of 47.1 miles per week. Assume that the population standard deviation for group runners is known to be 4.4 miles per week. She also interviews a random sample of 47 people who train on their own and finds that they run a mean of 48.5 miles per week. Assume that the population standard deviation for people who run by themselves is 1.8 miles per week. Test the claim at the 0.01 level of significance. Let group runners training for marathons be Population 1 and let individual runners training for marathons be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.
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
A nurse is interested in the amount of time patients spend exercising per day. According to a recent study, the daily workout time per adult follows an approximately normal distribution with a mean of 94 minutes and a standard deviation of 27minutes. If the nurse randomly samples patients in her office to analyze their exercise time and gets a standard error of 3minutes, how many patients did she sample?
A simple random sample of 95 basketball players is taken from different teams and their mean weight is found to be 226 pounds and the standard deviation of the population is 20 pounds. Using 0.05 level of significance , test the claim that the average weight for all basketball players is 231 pounds.
A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 9. Between what two values are the middle 80% of the hours spent studying?
Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.068.06 and a standard deviation of 1.521.52. Using the empirical rule, what percentage of American women have shoe sizes that are at least 9.589.58?
The combined SAT scores for the students at a local high school are normally distributed with a mean of 1478 and a standard deviation of 292. The local college includes a minimum score of 689.6 in its admission requirements.What percentage of students from this school earn scores that satisfy the admission requirement?

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