1, how large a sample sample should one select to be 86% confident that the samplingerror is 10 or less? assume that the population standard deviationis 250.
2, a simple random sampleof 500 provides 100 yes responses. compute the 94% confidence intervalfor the population proportion.
The solution provides step by step method for the calculation of confidence Interval for mean and sample size . Formula for the calculation and Interpretations of the results are also included.