Session Date
Lesson Topic
Variance and standard deviation
Lesson Outline
Explain that these are measures of dispersion, statistics that show how data is spread out. The formula for finding the variance is defined as the mean of the squared difference between each number in a set and the mean of all numbers in the set. A step by step formulation is given.
1) Determine the mean. 2) Determine the difference between each number and the mean. 3) Square each difference in step 2 4) Determine the mean of the squared difference. This number is variance.
If we let x equal the numbers and m equal the mean and n equal the number of events then
variance = (x1-m)2 + (X2-m)2 + (X... -m)2/ n . Assign: Determine the variance of a given set of numbers, show all steps...
1) Determine the mean. 2) Determine the difference between each number and the mean. 3) Square each difference in step 2 4) Determine the mean of the squared difference. This number is variance.
If we let x equal the numbers and m equal the mean and n equal the number of events then
variance = (x1-m)2 + (X2-m)2 + (X... -m)2/ n . Assign: Determine the variance of a given set of numbers, show all steps...
Session Minutes
60
Minutes Student Attended
30
Lesson Comments
We were able to list the steps and determine the variance for a series of numbers. Sam was proficient in these calculations. We could not proceed to the next step, the standard deviation today but will work on that on Tues. along with how to use this information.
Session Hours
1.00
Hours Attended
0.50
Entry Status
Review Status
Student Name(s)
Subject
School