(b) What is the value of the t test statistic the researchers can use to answer their question?

(c) What is the correct R code below that defines the alpha-level rejection region for this t test? Assume \"df\" is the correct test degrees of freedom.

a. qt(alpha, df)

b. qt(alpha/2, df)

c. qt(1 - alpha/2, df)

d. qt(1 - alpha, df)

(d) The researchers can also use the sign test to test the median difference (After - Before) to answer their research question. What is the value of the sign test statistic for this data?

a. 2

b. 5

c. 7

d. 9

e. same number as (b)