Suppose that a piano costs $5,000 and loses 20% of its value each year. The table below shows the value, v, of a piano after t years. Which of the following pairs of coordinates would represent the missing values in the table?

Write an equation that can be used to find the value of the piano, v, after t years

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.