1. Explain why the formula for sample variance divides SS by n - 1 instead of dividing by n. 2. for the following data, find the range and the semi-interquartile range: 3,4,5,7,9,10,11,13

3. for the following population of N=6 scores: 8,6,2,6,3,5

a. sketch a histogram showing the population distribution.

b. Locate the value of the of the population mean in your sketch, and make an estimate of the standard deviation

c, compute SS, variance, and standard deviation for the population (How well does your estimate compare with the actual value of o?}