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The research department of a solar manufacturer believes that a newly developed solar panel has a...

The research department of a solar manufacturer believes that a newly developed solar panel has a higher energy output than a previously developed panel. The research department collected the following information from two independent samples of both new and old solar panels.

New Panels Old Panels
Sample size 15 25
Average energy output (Watts) 228.5 227
Sample standard deviation (Watts) 2 1.5

(a) Find the point estimate for the difference between the population mean energy output of the new solar panels and the old solar panels (one decimal place). Type only the numeric answer in the box .

(b) Compute the pooled variance (three decimal places). Type only the numeric answer in the box .

(c) Compute the lower limit of the 95% confidence interval for the difference between the population mean energy output of the new solar panels and the old solar panels (three decimal places). Type only the numeric answer in the box .

(d) Compute the upper limit of the 95% confidence interval for the difference between the population mean energy output of the new solar panels and the old solar panels (three decimal places). Type only the numeric answer in the box .

Math   Statistics-And-Probability   
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