You are told that a random sample of 150 people from iowa has been given cholesterol tests, and 60 of these people had levels over the "safe" count of 200. construct a 95% confidence interval for the population proportion of people in iowa with cholesterol levels over 200. what is the upper value of the confidence interval?

Which system of linear inequalities is represented by the graph?

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.

The two cones below are similar. what is the height of the smaller cone?