Homework Sourse12Find sd The differences between two sets of dependent data
12)Find sd.
The differences between two sets of dependent data are 21, 21, 15, 18, 15. Round to the nearest tenth.
Solution
The difference are given as 21,21,15,18,15
First find the sum as = 90
Mean = 18
Std dev = rt of variance
= 2.68
=2.7
| x | x-xbar | (x-xbar)^2 |
| 21 | 3 | 9 |
| 21 | 3 | 9 |
| 15 | -3 | 9 |
| 18 | 0 | 0 |
| 15 | -3 | 9 |
| Total | 36 | |
| Variance | 7.2 |
