Question

3. For another machine part with standard deviation of .01 mm, how large of a sample would be necessary to estimate the mean within 0.001 mm at a confidence level of 99%.(

4. A sample of 100 people found that 56 of them intend to vote for a particular candidate. a. Find the 95% confidence interval of the true percentage who intend to vote for the candidate. b. Based upon the above survey, what is the probability that the candidate will receive a majority of the vote (over 50%)?

5. Find the 99% confidence interval for the variance and standard deviation of the active ingredient in a 500 mg pill if the sample size is 25 and the variance is 4 mg. Assume the variable is normally distributed.

Answer 1