15.5. Variance http://www.ck12.org
- What will a large variance look like on a histogram? What will a small variance look like on a histogram?
- You find some data organized in a bar graph. Could you calculate the variance of this data? Explain.
- A sample set of 20 exam scores is 67, 94, 88, 76, 85, 93, 55, 87, 80, 81, 80, 61, 90, 84, 75, 93, 75, 68, 100, 98.
Calculate the mean, variance, and standard deviation for this data. - All of Mike’s bowling scores are: 1, 1, 2, 10, 12, 1, 9, 6, 7, 8, 4, 3, 4, 1, 4, 1, 6, 7, 11, 5. Calculate the mean,
variance, and standard deviation for this data. - Why can’t you always calculate the population variance and standard deviation? Why do you sometimes have
to calculate the sample variance and standard deviation?