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To estimate the mean pregnancy length for the population of all smokers, the researchers find a 95% confidence interval based on the sample mean of 260 days.
The standard error in the sample means is [ Select ] days.
The margin of error for the 95% confidence interval is [ Select ] days.
We are 95% confident that the mean pregnancy length for [ Select ] is between [ Select ]days an[ Select ] days.
Sagot :
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