Imagine a researcher wanted to test the effect of the new drug on reducing blood pressure. In this s

[math_celebrity]

Imagine a researcher wanted to test the effect of the new drug on reducing blood pressure. In this study, there were 50 participants. The researcher measured the participants' blood pressure before and after the drug intake. If we want to compare the mean blood pressure from the two time periods with a two-tailed t test, how many degrees of freedom are there?
a. 49
b. 50
c. 99
d. 100


a. 49

Degrees of Freedom = n - 1
Degrees of Freedom = 50 - 1
Degrees of Freedom = 49