Author Question: Under what circumstances is the point-biserial correlation used? A) in the same circumstances ... (Read 83 times)

urbanoutfitters · **on:** Jun 20, 2018

Under what circumstances is the point-biserial correlation used?

A) in the same circumstances when a repeated-measures t test would be used
B) when X consists of regular, numerical scores but Y is dichotomous
C) when both X and Y are dichotomous variables
D) when both X and Y are measured on an ordinal scale (ranks)

Question 2

A sample from a population with = 40 and = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then how many scores are in the sample?

A) n = 100
B) n = 25
C) n = 5
D) n = 4