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Author Question: In developing an interval estimate of the population mean, if the population standard deviation is ... (Read 74 times)

jasdeep_brar

  • Hero Member
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  • Posts: 569
on: Jun 24, 2018
In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.
 a. it is impossible to develop an interval estimate
  b. a sample proportion can be used
  c. the sample standard deviation and t distribution can be used
  d. None of the answers is correct.

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 is the probability that a randomly selected tire will have a life of at least 30,000 miles?
 a. .4772
  b. .9772
  c. .0228
  d. None of the answers is correct.


HandsomeMarc

  • Sr. Member
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  • Posts: 360
Reply #1 on: Jun 24, 2018
Answer to Question 1

c

Answer to Question 2

b


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