you and your mom planted some seeds for a vegetable garden. each week you measure the height of the plants to see how much they have grown.
how many plants are 5 cm tall?
a) 3
b) 4
c) 5
d) 6
think its d.

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.