Today our task is to calculate the standard deviation by hand. The formula is given and the data has two lists. One with the number of each data point and the other with that data's frequency.
Example: data set 2,2,2,2,2,3,3,3,3,3,3,3,3,3,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5
The first list - data: 2, 3, 4, 5,
The second list is the frequency: 5 (there are 5 #2s), 9 (there are 9 #3s), 5 (there are 5 #4s) and 11 (there are eleven #5s.)
We will work with this data on the calculator tomorrow. We will also learn about normal distribution and z scores.
Tonight's homework is to finish the task that we did in class today.
Homework is in the book tomorrow. Please bring your book to class tomorrow.
Test - February 2, 2012
Open House January 26,2012 Thursday night.