A researcher wants a 90 percent chance of rejecting the null ...

[dakota nelson]

A researcher wants a 90 percent chance of rejecting the null hypothesis at the one-tailed .05 level with an effect size of .15 . The sample size needed is about
 
  a. 140.
  b. 160.
  c. 180.
  d. 200.
  e. 380

Question 2

The greatest statistical power occurs when
 
  a. the sample is small and heterogeneity is small.
  b. the sample is small and heterogeneity is large.
  c. the sample is large and heterogeneity is small.
  d. the sample is large and heterogeneity is large.

[chem1s3]

Answer to Question 1

E

Answer to Question 2

C

[dakota nelson]

Thanks for the timely response, appreciate it

[meow1234]

Wow, this really help