Say you were interested in the mean weight of 10yearold girls living in the United States Since it would have been impractical to weigh all the 10yearold girls in the United States you took a sample of 16 and found that the mean weight was 90 pounds This sample mean of 90 is a point estimate of the population mean A point estimate by itself is of limited usefulness because it does not reveal the uncertainty associated with the estimate you do not have a good sense of how far this sample mean may be from the population mean For example can you be confident that the population mean is within 5 pounds of 90 You
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