Island a is 210 miles from island b. a ship captain travels 230 miles from island a and then finds that he is off course and 180 miles from island b. what bearing should he turn to, so he is heading straight towards island b?
a. 135.53
b. 29.84
c. 119.84
d. 59.68

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.