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Author Question: An auto manufacturer wants to estimate the annual income of owners of a particular model of ... (Read 88 times)

lilldybug07

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on: Jun 24, 2018
An auto manufacturer wants to estimate the annual income of owners of a particular model of automobile. A random sample of 200 current owners is selected. The population standard deviation is known. Which Excel function would NOT be appropriate to use to construct a confidence interval estimate?
 a. NORM.S.INV
  b. COUNTIF
  c. AVERAGE
  d. STDEV

Question 2

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What percentage of tires will have a life of 34,000 to 46,000 miles?
 a. 38.49
  b. 76.98
  c. 50
  d. None of the answers is correct.


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Brenm

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

b

Answer to Question 2

b


lilldybug07

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Reply 2 on: Jun 24, 2018
Wow, this really help

xiazhe

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Reply 3 on: Yesterday
Excellent

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