50% Fri 7:54 PM Do Stat 119 Spring 2018: section 7 Homework: HWK#8 Score: 0 of 1

Question

50% Fri 7:54 PM Do Stat 119 Spring 2018: section 7 Homework: HWK#8 Score: 0 of 1 pt 11 of 14 (14 complete) Hw Score: 12.02%, 1.68 of 14 pts so that you can only make ould nor nally buy?" Of these users, 68% responded that they one copy of the CD a ery pre ase itWould you buy a Dwith this technology, o would you o use to buy it even if it was one you would buy the CD b) If the company wants to out the margin of error in half, how many users must they survey? a) (Round to one decimal place as needed.)

Explanation / Answer

n = 704 , p =0.68

z value at 95% = 1.96

CI = P + /- z * sqrt(p * ( 1 -p) / n)
= 0.68 +/- 1.96 * sqrt(0.68 * 0.32/704)
= (0.6455 , .7145)
The 95% CI is (64.6% , 71.6%)

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