The sales representative for a manufacturer of a new product claims that the product will increase output per machine by at least 15 units per hour. A line manager installs the product on 27 of the machines, and finds that the average increase was only 12 with a standard deviation of 16. a) Test the hypothesis at 90% confidence level and interpret your results. b) Form a 95% confidence interval for the population mean.

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The sales representative for a manufacturer of a new product claims that the product
will increase output per machine by at least 15 units per hour. A line manager installs
the product on 27 of the machines, and finds that the average increase was only 12 with
a standard deviation of 16.
a) Test the hypothesis at 90% confidence level and interpret your results.
b) Form a 95% confidence interval for the population mean.
Transcribed Image Text:The sales representative for a manufacturer of a new product claims that the product will increase output per machine by at least 15 units per hour. A line manager installs the product on 27 of the machines, and finds that the average increase was only 12 with a standard deviation of 16. a) Test the hypothesis at 90% confidence level and interpret your results. b) Form a 95% confidence interval for the population mean.
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