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Author Question: Suppose the amount of propane used per customer in a month is normally distributed with . Find a ... (Read 107 times)

Starlight

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on: Jun 24, 2018

  Suppose the amount of propane used per customer in a month is normally distributed with . Find a 95 confidence interval for if a randomly chosen sample of 30 customers has a mean propane usage of 110 gallons a month.
 

  a.(78.6, 141.4)
  b.(105.2, 114.8)
  c.(103.2, 116.8)
  d.(104.3, 115.7)

Question 2


  Which of the following is not a correct statement with regards to estimating a mean using a known ?
 

  a.If the sampling distribution for sample means has a mean equal to and a standard error equal to and the randomly sampled population is normally distributed, then the sampling distribution of has a normal distribution.
  b.The sampling distribution of is normally distributed only if the sampled population is normally distributed.
  c.A necessary assumption for estimating a mean using a known is that the sampling distribution of is normally distributed.
  d.If the sampling distribution for sample means has a mean equal to and a standard error equal to and the randomly sampled population is not normally distributed, then the sampling distribution of is approximately normally distributed only for sufficiently large sample sizes.


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cascooper22

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

correct: d

Answer to Question 2

correct: b


Starlight

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Reply 2 on: Jun 24, 2018
Gracias!

nyrave

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Reply 3 on: Yesterday
Wow, this really help

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