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Author Question: A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. ... (Read 184 times)

jenna1

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

C

Answer to Question 2

B


jenna1

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Reply 2 on: Jun 24, 2018
Excellent

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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