Martindate were tester which can compare two materials in, Ask an Expert

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Ledolter and hogg report that two different fabrics say x and y are compared on the martindate were tester which can compare two materials in sigle run, weights losses from seven runs are as follows:

x= 36 26 31 38 28 37 22
y= 39 27 35 42 31 39 21

Examine these data by creating the 90% confidence interval for difference of means. Define your assumption.

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