The time it takes a car to accelerate from a complete stop to a speed of 60 miles per hour is based on the
velocity, V, in meters per second, the car's average
power, P, in watts, and the mass of the car, m, in
3PT
kilograms. If y =
-, which of the following
m
gives the value of T, the time in seconds, in terms of
V, P, and m?

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.