Ex. 19 point b

d, and 19 A market research firm is interested in determining the proportion of s con. households that are watching a particular sporting event. To accomplish struct this task, it plans on using a telephone poll of randomly chosen house- cups holds. (a) How large a sample is needed if the company wants to be 90 percent per- certain that its estimate is correct to within 10.02? who (b) Suppose there is a sample whose size is the answer in part (a). If 23 percent of the sample were watching the sporting event, do you ex- er- pect that the 90 percent confidence interval will be exactly of length 0.02, larger than 0.02, or smaller than 0.02? (c) Construct the 90 percent confidence interval for part (b). What is the smallest n