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Author Question: When conducting a hypothesis test for the population mean when sigma is known and the sample size is ... (Read 38 times)

mspears3

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  • Posts: 586
on: Jun 24, 2018
When conducting a hypothesis test for the population mean when sigma is known and the sample size is 30 or more, the test statistic follows the ___________________ ____________.
 
  A) Student's t-distribution
  B) binomial distribution
  C) normal distribution
  D) exponential distribution

Question 2

Suppose the average tread-life of a certain brand of tire is 42,000 miles and that this mileage follows the exponential probability distribution.
 
  What is the probability that a randomly selected tire will have a tread-life between 30,000 and 50,000 miles?A) 0.1854
  B) 0.2719
  C) 0.5105
  D) 0.6959


reversalruiz

  • Sr. Member
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  • Posts: 327
Reply #1 on: Jun 24, 2018
Answer to Question 1

C

Answer to Question 2

A


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