Jason is selling video games. to earn his monthly bonus, he must sell a minimum of 5 games. he has 30 he can sell. the video games cost $20 each. the function f(x) = 20x can be used to represent this situation. what is the practical range of the function? all whole numbers from 5 to 30, inclusive. all whole numbers from 100 to 600, inclusive. all real numbers. all multiples of 20 between 100 and 600, inclusive.

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.