The relationship between the number of pounds (lb) of cheese and the total cost in dollars is shown in the graph. What is the unit price of cheese?
30
Cost (dollars)
2
3
4
5
Weight (pounds)
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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.