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March 26, 2015

March 26, 2015

Posted by **Anonymous** on Saturday, October 27, 2012 at 9:09pm.

Problem 3.1

"Column A contains aluminum content data from a sample of 100 cans taken from your Akron plant. The Akron plant produces 2 billion cans every year.

a) Construct a 95% confidence interval for the population mean aluminum content.

b) EXTRA CREDIT-Construct a 95% confidence interval for the total expenditure on aluminum at the Akron plant. How much money could AluminiCorp save if the Akron plant actually produced cans that were at the target aluminum content?

c) Based on your answer in part (a) (and part (b) if you did that), explain (in plain English) what these results mean.

Hint: make sure you keep your units of measurement consistent (grams v. pounds)!

Excel Tips: The Excel functions =TDIST and =TINV are similar to the functions =NORMSDIST and =NORMSINV and can be used to calculate T critical values. See the Excel helpfile for instructions on the syntax for this function.

General tip for this problem. In part (a), you calculated a confidence interval for aluminum content. The units of your mean and standard deviation are grams per can. For part (b), you need to first convert your sample mean and standard deviation from part (a) from grams per can into dollars per can. "

Problem 3.2

- stat (incomplete) -
**PsyDAG**, Sunday, October 28, 2012 at 6:26pmWe do not have access to your data.

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