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Effect of an Outlier The methods of this section have a fairly strict requirement that the two populations have normal distributions. The presence of an outlier is evidence against a normally distributed population. Repeat Exercise 6 after deleting the outlier of 504 lb in the sample of axial loads of cans that are 0.0111 in. thick. After deleting that outlier, the 174 values have a mean of 280.5 lb and a standard deviation of 22.1 lb. Does the outlier have much of an effect on the results?

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