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In a random sample of 50 babies 4 to 7 month old the average number of hours they slept per day turned out to be 14.2 hours with a standard deviation of 1.6 hours find and interpret a 90% confidence interval for the mean number of hours slept by babies at this age

  • statistics - ,

    90% = mean ± 1.645SEm

    SEm = SD/√n

    I'll let you do the calculations.

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