Question

UCO says that 15 % of its students recieved flu shots last year. A random sample of 1000 UCO students found that 220 recieved flu shots this year 1. Find a 95 % confidence interval for the proportion of students that recieved a flu shot this year. Round your answers to four decimal places. 2. There is enough evidence to show that the proportion of UCO students who recieved flu shots this year has changed from last year because 0.15 is not in the confidence interval sa3u More () Click to select your answer(s). here to search

Answer 1

220 х sample size sample proportion 1000.0 n x/n= p 0.220 std error (p*(1-p)/n) =Se 0.0131 for 95 % Cl value of z margin of error E=z*std error lower confidence bound-sample proportion-margin of error Upper confidence bound-sample proportion+margin of error 1.96 0.0257 0.1943 0.2457

1) 0.1943 < p <0.2457

2)True (As interval contains values higher than 0.15)