Compared to a z-score, a hypothesis test with a t statistic requires less information from the ...

Compared to a z-score, a hypothesis test with a t statistic requires less information from the population.
 
  Indicate whether the statement is true or false

Question 2

Compared to a z-score, a hypothesis test with a t statistic requires more information from the sample.
 
  Indicate whether the statement is true or false

Question 3

When the population variance or standard deviation is not known, you must use a t statistic instead of a z-score for a hypothesis test.
 
  Indicate whether the statement is true or false

Question 4

With  = .05, what is the critical t value for a one-tailed test with n = 15?
 
  a. t = 1.761 c. t = 2.145
  b. t = 1.753 d. t = 2.131