During a free fall, a skydiver falls 16 feet in the 1st second, 48 feet in the 2nd second, and 80 feet in the 3rd second. If she continues to fall at this rate, how many feet will she fall during the 10th second? simple interest

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.