Construct a 95% confidence interval estimate for the population mean, based on each of the following sets of data, assuming that the population is normally distributed:
Set 1:1, 1, 1, 1, 8, 8, 8, 8
Set 2: 1,2,3,4,5,6,7,8.

By what percent will the product of two numbers change, if the first number increases by 70%, while the second number decreases by 40%.

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