Data collected by a child development scientist produced a 95% confidence interval for the mean age

Data collected by a child development scientist produced a 95% confidence interval for the mean age, μ (in weeks) at which babies began to craw as [21.4, 31.6] a) what is the sample mean

The sample mean is = 26.5 b) what is the margin of error for the confidence interval

Margin of error = 31.6 – 26.5 = 5.1

Other factors remaining the same, how would the margin of error for the confidence interval be effected if the confidence level was reduced to 90%?  If the confidence level reduces to 90% then the Z value decreases so the margin of error will also decrease.

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