For items 27 to 29: A professor wants to determine whether there is a difference in the final averages between the past two semesters. Of his business statistics classes. For a random sample of 16 students from semester 1, the mean of the final averages was 75 with standard deviation of For a random sample of 9 students from semester 2, the mean was 73 with standard deviation of 27. If the final averages form semester 1 and 2 are assumed to be normally distributed with equal variances. Which of the following is the appropriate set of hypotheses? A. Ho: H1 - H2 s O vs HA: µ1 – µz > 0 B. Ho: H1 - H2 0 vs H4: H1 – H2 <0 C. Ho: H1 - Hz = 0 vs Ha: µ1 – H2 # 0 D. Ho: H1 - H2 0 vs HA: H1 – H2 = 0 28. What is the computed test statistics for the appropriate test? B. t = 0.8944 A. z 1.9964 C. t = 1.0018 D. z = 0.5009 29. What is the correct decision for the appropriate test at a 0.05 level of significance when the population variances are assumed to be equal? A. Do not reject the null hypothesis. B. Reject the null hypothesis BE C. Reject the alternate hypothesis D. Do not reject the alternate hypothesis.

For items 27 to 29: A professor wants to determine whether there is a difference in the final averages between the past two semesters. Of his business statistics classes. For a random sample of 16 students from semester 1, the mean of the final averages was 75 with standard deviation of For a random sample of 9 students from semester 2, the mean was 73 with standard deviation of 27. If the final averages form semester 1 and 2 are assumed to be normally distributed with equal variances. Which of the following is the appropriate set of hypotheses? A. Ho: H1 - H2 s O vs HA: µ1 – µz > 0 B. Ho: H1 - H2 0 vs H4: H1 – H2 <0 C. Ho: H1 - Hz = 0 vs Ha: µ1 – H2 # 0 D. Ho: H1 - H2 0 vs HA: H1 – H2 = 0 28. What is the computed test statistics for the appropriate test? B. t = 0.8944 A. z 1.9964 C. t = 1.0018 D. z = 0.5009 29. What is the correct decision for the appropriate test at a 0.05 level of significance when the population variances are assumed to be equal? A. Do not reject the null hypothesis. B. Reject the null hypothesis BE C. Reject the alternate hypothesis D. Do not reject the alternate hypothesis.

Name: For items 27 to 29: A professor wants to determine whether there is a
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
Description: For items 27 to 29: A professor wants to determine whether there is a difference in the finalaverages between the past two semesters. Of his business statistics classes. For a random sampleof 16 students from semester 1, the mean of the final averag

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

A different investor decides to invest $8000 in Fund A and $3000 in Fund B. Assuming the amounts gained by the two funds are independent, what are the mean and standard deviation of the amount gained by this investment in the first month?
Airline Fares. The mean airfare for flights departing from Buffalo Niagara International Airport during the first three months of 2017 was $320.51. Assume the standard deviation for this population of fares is known to be $80. Suppose a random sample of 60 flights departing from Buffalo Niagara International Airport during the first three months of 2018 is taken. If the mean and standard deviation of the population of airfares for flights departing from Buffalo Niagara International Airport didn’t changed between the first three months of 2017 and the first three months of 2018, what is the probability the sample mean will be within $20 of the population mean cost per flight? What is the probability the sample mean will be within $10 of the population mean cost per flight?
Mason earned a score of 226 on Exam A that had a mean of 250 and a standard deviation of 40. He is about to take Exam B that has a mean of 550 and a standard deviation of 25. How well must Mason score on Exam B in order to do equivalently well as he did on Exam A? Assume that scores on each exam are normally distributed.
Do question 1
Suppose that Jett achieves a score of 1250 on the SAT, and his sister Kate scores 29 on the ACT. The SAT scores are normally distributed with a mean of 1100 and standard deviation of 250. The ACT scores are normally distributed with a mean of about 20 and standard deviation of 5. Who did better, relative to their peers?
If the mean of the data is 130 with a standard deviation of 10, what percent of the data falls between the values of 100 and 160?
For her test grades, Gena has a mean = 65 and standard deviation = 25. Patti has a mean = 65 and standard deviation = 5. For which of the students can you more accurately predict the next test score, and why? Consider the variability of scores. Who is more likely to do either extremely well or extremely poorly on the next exam, and why? Explain the reason for adjusting the formula of the standard deviation/variance with n - 1 in the denominator?
Jeremiah earned a score of 530 on Exam A that had a mean of 450 and a standard deviation of 40. He is about to take Exam B that has a mean of 63 and a standard deviation of 20. How well must Jeremiah score on Exam B in order to do equivalently well as he did on Exam A? Assume that scores on each exam are normally distributed.
An incoming MBA student took placement exams in economics and mathematics. In economics, she scored 82 and in math 87. The overall results on the economics exam had a mean of 71 and a standard deviation of 7, while the mean math score was 69, with a standard deviation of 10. On which exam did she do better compared with the other students? Since she scored standard deviations V the mean in economics and standard deviations V the mean in mathematics, she did better on the exam. (Round to two decimal places as needed.)
Suppose in 2000, the science scores for female students had a mean of 146 with a standard deviation of 35. Assume that these scores are normally distributed with the given mean and standard deviation. _________________ of the female students scored between 76 and 216
A mathematics professor one to determine whether there is a different in the final average just between the past two semester (semester 1 and semester 2) of his business is statistics classes. For a random sample of 16 students from semester 1, the mean of the final averages was 75 with a standard deviation of 4. For a random sample of 9 students from semester 2, the mean was 73 with a standard deviation of 6. Choose the correct answer
In class A, Jamir got 85 for his first test. Jamir's class mean was 75 and the standard deviation was 5.In class B, Laurabelle got 80 in her first test. Laurabelle's class mean was 50 and the standard deviation was 10.In a fair comparison of the two students in two different classes, who did better in his or her test. (Compare Jamir and Laurabelle's standing in their classes.Note Z-score gives that information.) Jamir Laurabelle Both did the same none of the above