Jack plots points showing equivalent ratios on the coordinate plane below. Mc016-1. Jpg Which ordered pair, if plotted above, would represent a ratio that is equivalent to those shown? (1, 9) (3, 9) (4, 18) (5, 18).

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.