A 7,000-seat theater is interested in determining whether there is a difference in attendance between shows on Tuesday evening and those on Wednesday evening. Two independent samples of 18 weeks are collected for Tuesday and Wednesday. The mean attendance on Tuesday evening is calculated as 5,700, while the mean attendance on Wednesday evening is calculated as 6,080. The known population standard deviation for attendance on Tuesday evening is 520 and the known population standard deviation for attendance on Wednesday evening is 420. Which of the following is the value of the appropriate test statistic? z = -2.4119 tdf 2.4119 tdf=-2.4119 z = 2.4119 The GPA of accounting students in a university is known to be normally distributed. A random sample of 25 accounting students results in a mean of 3.20 and a standard deviation of 0.15. Construct the 99% confidence interval for the mean GPA of all accounting students at this university. 3.20 1.729 (0.15 / 25 3.20 1.96 (0.15 / 25 3.20 +2.086 (0.15 / 25 ) 3.20 2.80 (0.15 / 25