*question 9 I need a correct confidence Inverval

Homework: Ch... Question 9, 20.CE.33 HW Score: 65.1%, 11.07 of 17 points Save Part 2 of 3 Points: 0.25 of 1 A new vaccine was tested to see if it could prevent the ear infections that many infants suffer from. Babies about a year old were randomly divided into two groups One group received vaccinations, and the other did not The following year, only 332 of 2451 vaccinated children had ear infections, compared to 491 of 2455 unvaccinated children. Complete parts a) through c) below. a) Are the conditions for inference satisfied? n 1 sti In s O A. No. It was not a random sample. sti on 9 O B. No. The groups were not independent stic C. Yes. The data were generated by a randomized experiment, less than 10% of the population was sampled, the groups were independent, and there were on 1 more than 10 successes and failures in each group. stic on 1 O D. No. More than 10% of the population was sampled. b) Let p, be the sample proportion of success in the unvaccinated group, and let p2 be the sample proportion of success in the vaccinated group. Find the 95% confidence interval for the difference in rates of ear infection, P1 - P2 The confidence interval is%%) (Do not round until the final answer. Then round to one decimal place as needed.) (STA202 se | Priva