A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test ...

A researcher conducts a hypothesis test to evaluate the effect of a treatment. The hypothesis test produces a z-score of z = 2.37 . Assuming that the researcher is using a two-tailed test, what decision should be made?
 
  a. The researcher should reject the null hypothesis with  = .05 but not with  = .01.
  b. The researcher should reject the null hypothesis with either  = .05 or  = .01.
  c. The researcher should fail to reject H0 with either  = .05 or  = .01.
  d. Cannot answer without additional information

Question 2

Which of the following accurately describes the effect of increasing the alpha level?
 
  a. Increases the standard error and has no effect on the risk of a Type I error
  b. Decreases the standard error and has no effect on the risk of a Type I error
  c. Increases the risk of a Type I error and has no effect on the standard error
  d. Decreases the risk of a Type I error and has no effect on the standard error