Atray of cake samples contains a variety of flavors.

chocolate
33

vanilla
9

strawberry
3

what is the probability that a randomly selected piece of cake will be vanilla?

simplify your answer and write it as a fraction or whole number.

p( vanilla)

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.