Question

Calculate the estimate for the standard error of the difference between two proportions for each of the following cases. Consider that the standard error is to be used in confidence interval calculation. (Give your answers correct to four decimal places.) The proper TI-84 program to use for these calculations is

PRGM - STDERROR -1 PROPORTION

PRGM - STDERROR -2 MEANS

PRGM - STDERROR -2 PROP-HYP TST

PRGM - STDERROR -2 PROP-CNF INT

(a) n1 = 30, p1' = 0.8, n2 = 40, and p2' = 0.4

(b) n1 = 31, p1' = 0.59, n2 = 36, and p2' = 0.66

Answer 1

standard error for the difference of the two proprtions can be found by using the formula

SE = √( p1(1-p1)/n1)+(p2(1-p2)/n2)