Question 1 Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on non-textbook purchases at the university's bookstore during the fall semester.
|
|
|
University A
|
University B
|
|
|
Sample Size
|
50
|
40
|
|
|
Average Purchase
|
$260
|
$250
|
|
|
Population Standard Deviation(σ)
|
$20
|
$23
|
We want to determine if, on the average, students at University A spent more on non-textbook purchases at the university's bookstore than the students at University B.
a. Compute the test statistic.
b. Compute the p-value.
c. What is your conclusion? Let α = .05.
Question 2 In a residual plot against x that does not suggest we should challenge the assumptions of our regression model, we would expect to see
Question 3 If we are testing for the equality of 3 population means, we should use the
Question 4 The expected value of mean equals to the mean of the population from which the sample is drawn
Question 5 A simple random sample of size n from a finite population of size N is to be selected. Each possible sample should have