Problem 1.In an effort to compare the performance of students on two Introduction to Statistics courses, the following final exam data was collected.
a. Construct a null hypothesis such that the rejection of it would lead to the conclusion that the average score for the students of the first class was at least 5 points more than that of the second class.
b. With 95% confidence, what is your conclusion?
Chapter 11
Problem 1. Find the following chi-square distribution values from the table.
a. χ2 (.05) with df = 5
b. χ2 (.025) with df = 15
c. χ2 (.975)with df = 20
d. χ2 (.01) with df = 10
e. χ2 (.95) with df = 18
Problem 2. A sample of 20 items provides a sample standard deviation of 5.
a. Compute the 90% confidence interval estimate of the population variance.
b. Compute the 95% confidence interval estimate of the population variance.
c. Compute the 95% confidence interval estimate of the population standard deviation.