Discuss how each of the following will affect the width of a confidence interval for estimating a population proportion (in each case assume all other values remain constant):
a) An increase in sample size used to find pˆ
b) A higher confidence level
So, lower and upper limit of the confidence interval will decrease.
b.)as we know
Critical value at 95% confidence=1.96
critical value at 98% confidence=2.33
Critical value at 99% confidence=2.58
so, when confidence level increases due to that the Margin of error part
will increase, as Margin of error increase the width of the confidence interval increases.
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