How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the?

A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more than 2%? A previous study indicates that the proportion of households with two cars is... show more A researcher wishes to estimate the number of households with two cars. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more than 2%? A previous study indicates that the proportion of households with two cars is 19%.
a) 3150
b) 2552
c) 4
d) 2089
4 answers 4