Question 7 By how much must size be increased if the width o

Question 7 By how much must size be increased if the width of the cu t is to be the sample n If sample is what effect will this have on the width of the interval? size increased by a factor of2s Justify your assertions.

Solution

as sample size is in square root and in denominator, to half CI length, we increase sample size to 4 times.

With same formula, if sample size is increased by 25, CI length is divided by sqrt(25) = 5, i.e, CI length becomes 1/5th