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Question 3 [25] OK furniture store submit weekly records the number of customer contacts contacted per week....

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Basic Math

Question 3 [25]
OK furniture store submit weekly records the number of customercontacts contacted per week. A sample of 50 weekly reports showed asample mean of 25 customer contacts per week. The sample standarddeviation was 5.2. (Show all your works)
a) Compute the Margin of error at 0.05 significant level
[6]
b) Provide a 95% confidence interval for the population mean.
[4]
c) Compute the Margin of error at 0.01 significant level
[6]
d) Provide a 99% confidence interval for the population mean.
[4]
e) With a 0.99 probability, what size of sample should be taken ifthe desired margin of error is 1.5

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