A population has standard deviation 17.7.
Part 1 of 2
(a) How large a sample must be drawn so that a 90% confidenceinterval for u will have a margin of error equal to 3.2?
Round the critical value to no less than three decimal places.Round the sample size up to the nearest integer.
A sample size of ___ is needed to be drawn in order to obtain a90% confidence interval with a margin of error equal to 3.2.
Part 2 of 2
(b) If the required confidence level were 99.5, would the necessarysample size be larger or smaller
(larger/smaller), because the confidence level is(higher/lower).
