Question

Have you had a business presentation disturbed by a ringing cell phone? In a poll of 326 business men and women, 303 answered this question “yes” and only 23 answered “no” (“You Say,” Presentations: Technology and Techniques for Effective Communication, January 2003, 18). Round p-hat to 4 decimal places! Which of the following represents a 95% confidence interval for the population proportion of business men and women who have had their presentations disturbed by cell phones? 0 (0.9112, 0.9476) 0 (0.9016, 0.9572) O (0.8929, 0.9659) O (0.9061, 0.9527) 0 (0.8839, 0.9750)

Answer 1

ܝܝܝܝܝܝܝܝܝ re (@)-£ - 393 Ho. 9294 7 95% CI for p = P z. " ܙ 0215 - sܘ.zo v ( . ozk ܂ ܂9 .ܐ - ( 2 0 : 929_- ; %35 ., 96.ܐ + 2 0.9294x0.5 106 326 ܕ021 .6 + 9296 .0 - ( 552 9 .ܘ ] ] 901 .6) -