Author Question: The z-value needed to construct a 92.5 confidence interval estimate for the difference between two ... (Read 135 times)

LaDunn · **on:** Jul 24, 2018

The z-value needed to construct a 92.5 confidence interval estimate for the difference between two population proportions is:
a. 2.58
b. 2.33
c. 1.96
d. 1.78
e. 1.33

Question 2

Which of the following statements is false?
a. Nonparametric methods provide test statistics for an unspecified distribution.
b. When choosing between parametric and nonparametric tests, we are interested primarily in the control of error, the relative power of the test, and efficiency.
c. For a statistical procedure to be parametric, either we assume that the parent population is at least approximately normally distributed or we rely on the central limit theorem to give us a normal approximation.
d. None of the above.