(07.05 mc)

which of these is a simplified form of the equation 8p + 4 = − p + 7 + 2p + 3p?
14p = 11
8 = 4
4p = 3
12 = 13

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.