Serika has hired tom to build her a dollhouse. the dollhouse will be a scale model of her home, and the living room is 12 inches by 8 inches. the living room in serika's house is 18 feet by 12 feet. what scale is used to make the model?

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.