The graph shows the function f(x). Which equation represents f(x)?
Of(x) = -3
Of(x) = -3/x-1
f(x)
Of(x) = 37-x-1
Of(x) = 37-x
- 10 -
2
4 6
8 10
X
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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.