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Author Question: Construct a 99 confidence interval for the population mean, . Assume the population has a normal ... (Read 98 times)

nautica902

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on: Jul 24, 2018
Construct a 99 confidence interval for the population mean, . Assume the population has a normal distribution. A group of 19 randomly selected employees has a mean age of 22.4 years with a standard deviation of 3.8 years.
 
  Round to the nearest tenth. A) (19.9, 24.9 ) B) (16.3, 26.9 ) C) (17.2, 23.6 ) D) (18.7, 24.1 )

Question 2

The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 3000 miles.
 
  What warranty should the company use if they want 96 of the tires to outlast the warranty? A) 54,750 mi B) 65,250 mi C) 57,000 mi D) 63,000 mi


jessicaduplan

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

A

Answer to Question 2

A


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nautica902

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Reply #2 on: Jul 24, 2018
TY


jessicaduplan

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Reply #3 on: Jul 24, 2018
You're welcome


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