RANGE

Find the range of each set of data.

(a) 9, 11, 16, 3, 14, 5, 15

(b) 1.8, 2.4, 1.5, 2.7, 2.9, 1.9

(c) 19, +15, -18, 0, +16, -12, +17

(d) 354, 279, 381, 258, 392, 295, 314

STANDARD DEVIATION

______________________ ______________________ ______________________ ______________________

Measures of Dispersion and Data Analysis Quiz

First, calculate the standard deviaon for the following final grades for students thatreceived extra help for CJBS 250.

Score 1 Score 2 Score 3 Score 4 Score 5 Score 6

Now, calculate the standard deviaon for the following final grades for students that didnot receive extra help for CJBS 250.

Score 1 Score 2 Score 3 Score 4 Score 5 Score 6

X	xX-x	(X-x)2
83
86
81
87
84
80

X	xX-x	(X-x)2
69
79
98
79
99
77

1)What is the mean for the final grades of students that received extra help for CJBS250?

2) What is the standard deviaon for the final grades of students that received extra helpfor CJBS 250?

3) What is the mean for the final grades of students that did not receive extra help forCJBS 250?

4) What is the standard deviaon for the final grades of students that did not receiveextra help for CJBS 250?

5) What does this informaon tell us?

USE OF DESCRIPTIVE STATISTICS ON VARIABLES

Remembering the levels of measurement that were discussed in Chapter 4 idenfy the level of measurement for each variable below and indicate which descripve stascs (measures of central tendency and measures of dispersion) can be ulized for analysis.

1) Level of sasfacon with law enforcement2) Length of prison sentence (in years) 3) Names of New York City Transit Staons4)Temperatures in New York City in July