1. The roots of a quadratic are x= -5 and x=3. Which of the following are possible factors of the quadratic? (1) (X - 5) and (x + 3)
(2) (x + 5) and (x - 3)
(3) x= -5 and x = 3
(4) x = 5 and x=-3​

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.