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Author Question: According to R.L. Polk & Co, Americans held onto their new vehicles for an average of 71.4 ... (Read 106 times)

vicotolentino

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on: Jun 24, 2018
According to R.L. Polk & Co, Americans held onto their new vehicles for an average of 71.4 months.
 
  A random sample of 60 adults who recently sold their new vehicle was selected. Assuming the standard deviation for this population is 15.8 months, the standard error for this sample is ________.
  A) 1.30
  B) 2.04
  C) 3.56
  D) 5.92

Question 2

YouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. A random sample of 21 people who watched online videos was selected.
 
  The sample standard deviation for the length of the video was found to be 2.5 minutes. Using  = 0.10, the critical value for this hypothesis test would be ________.A) 12.443
  B) 28.412
  C) 29.615
  D) 30.813


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Christopher

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

B

Answer to Question 2

B


vicotolentino

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Reply 2 on: Jun 24, 2018
Gracias!

juliaf

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Reply 3 on: Yesterday
:D TYSM

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