Author Question: For some value of z, the probability that a standard normal variable is below z is 0.2090 . The ... (Read 36 times)

NguyenJ · **on:** Jul 24, 2018

For some value of z, the probability that a standard normal variable is below z is 0.2090 . The value of z is:
a. 0.81
b. 0.31
c. 0.31
d. 1.96
e. 1.62

Question 2

When the necessary conditions are met, a two-tail test is being conducted to test the difference between two population proportions. If the value of the test statistic is 2.05, then the p-value is:
a. 0.4798
b. 0.0404
c. 0.2399
d. 0.0202
e. 0.1982