1. To construct a 95% confidence interval for the difference μ1 - μ2 for two populations with equal standard deviations where samples n1 = 20 and n2 = 22 are taken, which R instruction is correct to find the critical value t∗ for the formula x¯1 - x¯2 ± t∗ SE? A. qt(0.95, df = 40) B. qt(0.975, df = 40) C. pt(0.975, df = 19) D. qt(0.95, df = 19)
Please answer the following multiple choice questions
1. To construct a 95% confidence interval for the difference μ1 - μ2 for two populations with equal standard deviations where samples n1 = 20 and n2 = 22 are taken, which R instruction is correct to find the critical value t∗ for the formula x¯1 - x¯2 ± t∗ SE?
A. qt(0.95, df = 40)
B. qt(0.975, df = 40)
C. pt(0.975, df = 19)
D. qt(0.95, df = 19)
2. In a criminal trial where the null hypothesis is innocence, a Type I error is made when:
A. a guilty defendant is acquitted
B. an innocent person is acquitted
C. a guilty defendant is convicted
D. an innocent person is convicted
3. Given the least squares regression line y^ = 7 + 0.2x
A. as x increases by 0.2 unit, so does y by 1 unit on average.
B. as y increases by 1 unit, so does x by 0.2 units on average.
C. as x increases by 1 unit, so does y by 0.2 units on average.
D. as y increases by 0.2 unit, so does x by 1 unit on average.
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