To track the reptile population around a lake, researchers marked 200 turtles. A few weeks later, they counted 480 turtles, of which 64 were marked. To the nearest whole number, what is the best estimate for the turtle population?

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.