For some positive value of z, the probability that a standard ...

[ereecah]

For some positive value of z, the probability that a standard normal variable is between 0 and z is 0.3770 . The value of z is:
 a. 0.18
  b. 0.81
  c. 1.16
  d. 1.47
  e. 1.12

Question 2

A sample of size 150 from population 1 has 40 successes. A sample of size 250 from population 2 has 30 successes. The value of the test statistic for testing the null hypothesis that the proportion of successes in population one exceeds the proportion of successes in population two by 0.05 is:
 a. 1.645
  b. 2.327
  c. 1.960
  d. 1.977
  e. 1.772

[abro1885]

Answer to Question 1

C

Answer to Question 2

B

[ereecah]

Thank you!

[abro1885]

Always glad to help...