Texts: The following are the number of hours that 10 police officers have spent being trained in how to handle encounters with people who are mentally ill: 4, 11, 12, 9, 6, 10, 15, 9, 3, 13.
Calculate the (a) range, (b) variance, and (c) standard deviation for these self-reported scores. Keep two decimal places.
X
Xbar
(X - Xbar)
(X - Xbar)^2
∑
a. What is the range? _____
b. What is the variance? _____
c. What is the standard deviation? _____