Do H Christina Henry- Google Chrome Secure https//www ayeHomeworkaspx BUSA 2100

Question

Do H Christina Henry- Google Chrome Secure https//www ayeHomeworkaspx BUSA 2100 A Fal17 Homework: CH09b and 11a Confidence Intervals Save Score: 0 of 2 pts 70f 17 (6 complete) HYV Score: 14 38%, 3 45 of 24 pt 9.1.54 Question Heb Direct mail advertisers send solicitations (junk mair') to thousands of potential customers in the hepe that some will buy the company's product The response rate is usualy quite low. Suppose a company wants to test the response to a new fSyer and sends it ta 1130 peeplerandomly selectad from their mailing ist of aver 200 000 people. Thay get orders from 145 of the recipients Use this information to complote parts a trough d a) Create a 90% coefdence iterval for the percentage of people the company contacts who may buy something ©%Dy) Round to one decimal place as needed) Enter your answer in the edit feids and then click Check Answer

Explanation / Answer

P = 145/1130 = 0.128

At 90% confidence interval the critical value is 1.645

The confidence interval is

P +/- z* * sqrt(P * (1 - P)/n)

= 0.128 +/- 1.645 * sqrt(0.128 * 0.872/1130)

= 0.128 +/- 0.0163

= 0.1117, 0.1443

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