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.
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University A
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University B
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Sample Size
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50
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40
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Average Purchase
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$260
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$250
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Population Standard Deviation(σ)
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$20
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$23
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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