Find the interquartile range (iqr) of the data in the dot plot below.

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25

Name two numbers whos difference is -3

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.