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Author Question: A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. ... (Read 214 times)

jenna1

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A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. If the sample size was 100 (other factors remain unchanged), the interval for  would
 a. not change
  b. become narrower
  c. become wider
  d. become zero

Question 2

A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. The 96.6 confidence interval for  is
 a. 63.00 to 67.00
  b. 60.76 to 69.24
  c. 61.08 to 68.92
  d. 60.00 to 80.00



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mcarey591

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Answer to Question 1

C

Answer to Question 2

B




jenna1

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Reply 2 on: Jun 24, 2018
Thanks for the timely response, appreciate it


meganmoser117

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

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