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Vikki [24]
3 years ago
14

Give an estimate of the mean hardness that you would expect after 37 and 41 hours; and a 85% confidence interval for each estima

te. which confidence interval is wider and why is it wider?
Mathematics
1 answer:
Jlenok [28]3 years ago
4 0
The predicted value of hardness at 37 hours is 243.87 and an 85% confidence interval for the mean hardness is (242.12, 245.61). At 41 hours, the predicted hardness is 252 and an 85% confidence interval for mean hardness is (249.83, 254.18). The confidence interval for X is equals to 41 which is wider because the value 41 is farther away from the sample mean X than is 37. As an outcome, the standard error for the prediction is larger.
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