Find the percent of change for #1-5 1. Xbox one goes from $399 to $199.
2. A slice of pizza increases from $1.25 to $3.50
3. The price of a Halloween costume goes from$25 to $9.99
4. The price of a bagel goes from $0.75 to $1.10
5. 16 bagels to 0 bagels.

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.