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Author Question: In order to estimate the average daily down time, a manufacturer randomly samples 40 days of ... (Read 90 times)

rosent76

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on: Jun 24, 2018
In order to estimate the average daily down time, a manufacturer randomly samples 40 days of production records and found a mean of 55.576 minutes and standard deviation of 77.9 minutes. An 80 confidence interval is:
 a. 55.675  1.28(12.32).
  b. 55.675  1.304(12.32).
  c. 55.675  1.28(77.9).
  d. 55.675  1.304(77.9).

Question 2

The t-distribution approaches the normal distribution as the:
 a. degrees of freedom increase.
  b. degrees of freedom decrease.
  c. sample size decreases.
  d. population size increases.


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sarahccccc

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

B

Answer to Question 2

A


rosent76

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Reply 2 on: Jun 24, 2018
Excellent

phuda

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Reply 3 on: Yesterday
Wow, this really help

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