The mean GPA of night students is 2.28 with a standard deviation of 0.39. The mean...

The mean GPA of night students is 2.28 with a standard deviation of 0.39. The mean GPA of day students is 1.91 with a standard deviation of 0.64. You sample 30 night students and 20 day students.

a. What is the mean of the distribution of sample mean differences (night GPA - day GPA)?

b. What is the standard deviation of the distribution of sample mean differences (night GPA - day GPA)?

c. Find the probability that the mean GPA of the sample of night students is less than the mean GPA of the sample of day students.

Expert Solution

orchestra answered 1 year ago

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