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Author Question: For some positive value of z, the probability that a standard normal variable is between 0 and z is ... (Read 52 times)

ereecah

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on: Jul 24, 2018
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


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abro1885

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Reply #1 on: Jul 24, 2018
Answer to Question 1

C

Answer to Question 2

B


ereecah

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Reply #2 on: Jul 24, 2018
Thank you!


abro1885

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Reply #3 on: Jul 24, 2018
Always glad to help...


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