PLEASE HELP!! Which of the following is best described as the quality a design has if it
maintains all of its characteristics when it is reflected over an axis lying in its
plane?

A. Reflectional symmetry

B. Line symmetry

C. Bilateral symmetry

D. Rotational symmetry

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.