An automobile dealership has found that for every 220 cars sold, 26 will be brought back to the dealer for major repairs. If the dealership sells 1760 cars this year, approximately how many cars will be brought back for major repairs?

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.