Here are summary statistics for randomly selected weights of newborn girls: nequals247, x overbarequals30.4 hg, sequals7.2 hg
. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 28.8 hgless thanmuless than31.0 hg with only 19 sample values, x overbarequals29.9 hg, and sequals2.8 hg? What is the confidence interval for the population mean mu?
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Concepts and reason
The confidence level of an interval estimate of a parameter is the probability that the interval estimate will contain the parameter, assuming that a large number of samples are selected and the estimation process on the sample parameter is repeated.
A confidence interval is a specific interval estimate of a parameter determined by using data obtained from a sample and by using the specific confidence level of the estimate.
The margin of error is the maximum likely difference between the point estimate of a parameter and the actual value of the parameter.
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