Under what conditions can the t-distribution be correctly ...

[jeatrice]

Under what conditions can the t-distribution be correctly employed to test the difference between two population means?
 
  A) When the samples from the two populations are small and the population variances are unknown
  B) When the two populations of interest are assumed to be normally distributed
  C) When the population variances are assumed to be equal
  D) All of the above

Question 2

In determining the sample size requirement for an application involving the estimation of the proportion of department store customers who pay using the store's credit card,
 
  the closer the true proportion is to .5, the larger will be the required sample size for a given margin of error and confidence level.
   Indicate whether the statement is true or false

[okolip]

Answer to Question 1

D

Answer to Question 2

TRUE