Find s d
-The differences between two sets of dependent data are 21, 21, 15, 18, 15. Round to the nearest tenth.
A) 3.0
B) 6.0
C) 2.4
D) 3.9

Question

Find s d 
-The differences between two sets of dependent data are 21, 21, 15, 18, 15. Round to the nearest tenth.
A) 3.0
B) 6.0
C) 2.4
D) 3.9

Quizplus · Accepted Answer

The standard deviation of the differences is calculated by finding the square root of the variance. The variance is the average of the squared differences from the mean. The mean of the differences is 18. The squared differences from the mean are (21-18)^2, (21-18)^2, (15-18)^2, (18-18)^2, (15-18)^2, which are 9, 9, 9, 0, 9. The average of these squared differences is 7.2. The square root of 7.2 is approximately 2.7, which rounds to 3.0.

Find Sd -The Differences Between Two Sets of Dependent Data Are 21

Find S_d -The Differences Between Two Sets of Dependent Data Are 21