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Author Question: When should a t statistic be used? a.When the mean is known but the standard deviation is ... (Read 118 times)

sjones

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on: Jun 24, 2018

  When should a t statistic be used?
 

  a.When the mean is known but the standard deviation is unknown and must be estimated by s.
  b.When the standard deviation is known but the mean is unknown and must be estimated by .
  c.When both the mean is known and the standard deviation is known.
  d.When both the mean is unknown and must be estimated by and the standard deviation is unknown and must be estimated by s.

Question 2


  Suppose a random sample of 10 televisions has a mean life of 25 years. If it is known that , what is the test statistic for testing H0: and Ha: ?
  a.-2.66
  b.There is not enough information given to determine the test statistic.
  c.0.60
  d.0.004
 


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Meganchabluk

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

correct: d

Answer to Question 2


correct: a


sjones

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Reply 2 on: Jun 24, 2018
Thanks for the timely response, appreciate it

nathang24

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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