#### Details of this Paper

##### Calculate the upper value (limit) for the interval estimate of the difference between the proportions of

Description

solution

Question

Calculate the upper value (limit) for the interval estimate of the difference between the proportions of two populations where 286 in a sample of 2,118 from the first population exhibited the characteristic of interest and 251 in a sample of 2,682 from the second population exhibited the characteristic of interest. Use alpha=0.02. Use Excel's "normsinv" function to calculate the critical value of z.;Please input in excel so that I can see the way the correct answer is found. You had given me the answer of;Solution;We have alpha = 0.02, then alpha/2 = 0.01;Using = normsinv (0.01), the critical value is 2.326;We find the common proportion first.;P = (X1 + X2)/ (n1 + n2);= (286 + 251)/ (2118 + 2682);= 0.1119;p?1 = X1/n1;= 286/2118;= 0.135;p?2 = X2/n2;= 251/2682;= 0.0936;Upper limit is calculated by:-;(p?1- p?2) + Z?/2 *?((p(1-p))/n1+(p (1-p))/n2);(0.135-0.0936) + 2.326 *?((0.1119(1-0.1119))/2118+(0.1119 (1-0.1119))/2682);0.0414 + 2.326*0.0079;0.0414 + 0.0183;0.0597;I just can't seem to get the same answer as you have. Thank You

Paper#31858 | Written in 18-Jul-2015

Price : \$22