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question attached Based on a survey of 12 mothers conducted by Essential Baby, the age in weeks at which the babies first crawl is on

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Based on a survey of 12 mothers conducted by Essential Baby, the age in weeks at which the babies first crawl is on average 38.3 with a sample standard deviation 5 =10.0. Construct a 70% confidence interval for the mean age at which a baby first crawls. Show the formula you used and all the steps in your calculation

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