Bruce and mila are collecting baseball cards from their favorite teams, the orioles and the pirates. the equation r+p=28 represents the number of cards bruce has. the equation 2r+p=43 represents the number of cards mila has.

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.