Which sample will yield a confidence interval with a larger margin of error? (A) A simple random sample of 300 students at your college or university. (B) A simple random sample of 200 students at your college or university. Explain.
B) A smaller sample produces a larger confidence interval (larger m). A large sample will better estimate the mean and produce a smaller confidence interval.
The mean stress level of 720 millennials was found to be 5.5 (on a 10-point scale). Assume the population standard deviation is 2.8. Find the 95% confidence interval for this sample.
(5.2955, 5.7045)
You are planning to study the average Halloween candy consumption of Americans. With a margin of error no more than 15 kcal/d and a standard deviation equal to 540 kcal/d, what is the sample size needed for a 99% C.I.?
8600 Americans
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