PLEASE VERY QUİCKLY Assume that we want to make an estimate about the density of copper. We collect 42 sample of copper specimens which had a mean value of 8.96 g/cm3 and a standard deviation of 2.8 g/cm3 . a) Construct a 90% confidence interval for the real density value of copper based on the sample data. b) For 90% confidence level, how many more data is needed to decrease the margin of error to at most B=0.25 g/cm3 (W=2B, where W is the width of the confidence interval).
Unitary Method
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PLEASE VERY QUİCKLY
Assume that we want to make an estimate about the density of copper. We collect 42 sample of copper specimens which had a
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