Wayne is solving a system of linear equations. y =
4
x = -2
x + 5
To solve this system, he graphed the line y =
- x + 5.
2, at which point will he find the solution of this
When Wayne graphs the line x =
system of linear equations?

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.