Find a confidence interval of the specified level for the difference in mean pit depth for each

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Find a confidence interval of the specified level for the difference in mean pit depth for each of the following values for humidity and pairs of durations.

a. \(40 \%\) humidity: Difference between mean pit depths at four weeks and 26 weeks, \(95 \%\) confidence

b. \(40 \%\) humidity: Difference between mean pit depths at 26 weeks and 52 weeks, \(90 \%\) confidence

c. \(75 \%\) humidity: Difference between mean pit depths at four weeks and 26 weeks, \(98 \%\) confidence

d. \(75 \%\) humidity: Difference between mean pit depths at 26 weeks and 52 weeks, \(99 \%\) confidence

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