Measures of Dispersion and Data Analysis Quiz

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

First, calculate the standard deviaon for the following nal grades for students that received extra help for CJBS 250.

	X	x	X - x	(X - x )2
Score 1	83
Score 2	86
Score 3	81
Score 4	87
Score 5	84
Score 6	80

Now, calculate the standard deviaon for the following nal grades for students that did not receive extra help for CJBS 250.

	X	x	X - x	(X - x )2
Score 1	69
Score 2	79
Score 3	98
Score 4	79
Score 5	99
Score 6	77

1) What is the mean for the nal grades of students that received extra help for CJBS 250?

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

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

4) What is the standard deviaon for the nal grades of students that did not receive extra 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 enforcement

2) Length of prison sentence (in years)

3) Names of New York City Transit Staons

4) Temperatures in New York City in July