6) Determine which of the expressions could be used to represent the following calculation:
Divide the difference between 96 and 72 by 12
Select all that apply.
. A(96-73-12
B.96-72-12
. 96-12-72
D.24+12
E.96-6
.

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.