10.52 The average depth of bedrock at two possible construction sites is to be compared by driving five piles at random locations within each site. The results, with depths in feet, are as follows:

Do the average depths of bedrock differ for the two sites at the 10% significance level? What assumptions are you making?

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Site A n = 5 Site B n = 5 x = 142 S =14 X2 134 $2 = 12