I'd appreciate it if you could help me! Thank you! (Worth 10+ Points.) A book is 1/2 an inch thick. If a shelf is 5 3/4 inches wide, how many books can fit in a 5 shelf bookcase? Create and solve an equation. Divide.

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.