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Author Question: Thirty randomly selected students took the calculus final. If the sample mean was 92 and the ... (Read 23 times)

swpotter12

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on: Aug 2, 2018
Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, construct a 99 percent confidence interval for the mean score of all students.
 
  A) 87.29 <  < 96.71 B) 87.77 <  < 96.23 C) 89.08 <  < 94.92 D) 87.27 <  < 96.73

Question 2

To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19 randomly selected dowels and finds the standard deviation of the sample to be s = 0.16.
 
  Find the 95 confidence interval for the population standard deviation .
  A) 0.15 <  < 0.21 B) 0.13 <  < 0.22 C) 0.11 <  < 0.25 D) 0.12 <  < 0.24


Natalie4ever

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Reply #1 on: Aug 2, 2018
Answer to Question 1

Props to you, cheers.

Answer to Question 2

D


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swpotter12

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Reply #2 on: Aug 2, 2018
TY


Natalie4ever

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Reply #3 on: Aug 2, 2018
You're welcome


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