Under what circumstances is the phi-coefficient used? A) when ...

[lidoalex]

Under what circumstances is the phi-coefficient used?
 
  A) when one variable consists of ranks and the other is regular, numerical scores
  B) when both variables consists of ranks
  C) when both X and Y are dichotomous variables
  D) when one variable is dichotomous and the other is regular, numerical scores

Question 2

A sample of n = 4 scores is obtained from a population with  = 70 and  = 8. If the sample mean corresponds to a z-score of 2.00, then what is the value of the sample mean?
 
  A) M = 86
  B) M = 78
  C) M = 74
  D) M = 72

[Yixagurpuldink]

Answer to Question 1

C

Answer to Question 2

B