Question 3 (1 point) The average hourly wage of workers at a fast food restaurant is $6.50/hr. Assume
the wages are normally distributed with a standard deviation of $0.45. If a worker at
this fast food restaurant is selected at random, what is the percent of workers who
earn more than $6.75?
28.9%
5.2%
071.1%
42.1%

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.