Question

LA brand manager for o brand of tOothepaste must pian a campaign designed to ncrcase brand recognition.He w ants to first aetevmine the percentage of adUtS nho nave Beseon neavd of the prand. How many aduits must ne survey In order to be that nis eshimate points af th rue population perceinage 9010 confide is Within seven percentage A)Assome Hnat noming S Known about the per cent of aduits nho have neaY d B Assume hat aren SUYvey suggesa 84 %0 af adu tS have heard that about

Answer 1

Answer Date: 08/11/2019 a) The sample size is, From the standard normal table, the z-critical value at 90% confidence is 1.645. The information represent E = 0.07, p=0.50 and z. = 1.645 for finding sample size. n= xÞ(1-P) (1.645 x0.50(1-0.50) 0.07 *0.50(1-0 50 = 138.06 = 139 The sample size is 139. b) The sample size is,

From the standard normal table, the z-critical value at 90% confidence is 1.645. The information represent E = 0.07, p=0.84 and ze = 1.645 for finding sample size. n=(xÞ(1-) 1.645) 1 x 0.84(1-0.84) (0.07) = 74.22 = 75 The sample size is (75)