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Author Question: A musician plans to perform 8 selections. In how many ways can she arrange the musical selections? ... (Read 195 times)

BRWH

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on: Aug 1, 2018
A musician plans to perform 8 selections. In how many ways can she arrange the musical selections?
 
  A) 362,880 B) 40,320 C) 8 D) 64

Question 2

The standard deviation of math test scores at one high school is 16.1. A teacher claims that the standard deviation of the girls' test scores is smaller than 16.1. A random sample of 22 girls results in scores with a standard deviation of 15.1.
 
  Use a significance level of 0.01 to test the teacher's claim.


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bookworm410

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Reply #1 on: Aug 1, 2018
Answer to Question 1

B

Answer to Question 2

Test statistic: X2 = 18.472. Critical value: X2 = 8.897. Fail to reject . There is not sufficient evidence to support the claim that the standard deviation of the girls' test scores is smaller than 16.1.


BRWH

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Reply #2 on: Aug 1, 2018
Thank you!


bookworm410

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Reply #3 on: Aug 1, 2018
Always glad to help...


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