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Author Question: The sample mean for a recent introductory psychology test was 78 and the sample variance was 9 . ... (Read 45 times)

OSWALD

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on: Jun 20, 2018
The sample mean for a recent introductory psychology test was 78 and the sample variance was 9 . Approximately what proportion of the scores was above 81?
 
  a. 0.50 c. 0.16
  b. 0.68 d. 0.34

Question 2

Using the appropriate values from the z-table in the textbook appendix, find the z-score for which the area beyond z in the tail is 0.2546.
 
  a. 0.66 c. 0.66
  b. 0.2454 d. 0.2454


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millet

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Reply #1 on: Jun 20, 2018
Answer to Question 1

C

Answer to Question 2

A


OSWALD

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Reply 2 on: Jun 20, 2018
Excellent

vickyvicksss

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Reply 3 on: Yesterday
Wow, this really help

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