If you have samples of n1 = 13 and n2 = 27, in performing the pooled-variance t test, how many degrees of freedom do you have?

question 8 options:
1) none of the other answers
2) 38
3) 40
4) all of the other answers (except for "none of the other answers")
5) 39
6) 14
7) 351

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Having a hard time understanding this question (see attachment).

Astocks price gained 3% in april and 5% in may and then lost 4% in june and 1% in july during which month did the stocks price change the most