2.2 A sample is drawn from a population of pre-mature babies to measure their weights(Y) in kilograms. From the sample the followings were derived: ∑fy=308, ∑f=81, sample variance S² is 4.349.
Calculate the mean weight of the babies
Calculate the standard Error
Construct a 95% Confidence Interval for the true average weight and interpret the result. [Hint: Use t 1 -α/2;n-1=t 0.975 (80) = 3.81].
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