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...

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.