Question

Clear my choice Catherine Cho, Director of Marketing Research at Vitalglow Pty Ltd, is evaluating consumer acceptance of a new toothpaste package. She plans to use a 80% confidence interval estimate of the proportion of Darwin households which prefer the new packages; she will accept a 0.05 error. Previous studies indicate that new packaging has an approximately 70% acceptance rate. The sample size should be at least Select one: O a. 27 b. 427 C. 59 d. 323 A researcher conducts a study to determine what the population proportion is for a given characteristic. It is believed from previous studies that the proportion of the population L AS The che

Answer 1

The formula to calculate the sample size fox proportion is given by 2 n = P(1-P) (2 6/2 Given Significance level x: 1-0.80 =0.2 Critical value: Za/2 = 1.28 error : E = 0.05 successes : Margin of The proportion P=0.70 Now, the required sample size will be: n = (0.70) (0.30)(1.28 2 10.05 137.613