Evidence-Based Practice for Nurses

FIGURE 13-1

Frequency Polygon and Histogram of

Age Data

2

4

5

3

1

7

6

0

18–19 20–21 22–23 24–25 >25

Age (in years)

18–19 20–21 22–23 24–25 >25

Age (in years)

Frequency

Histogram for grouped age data

2

4

5

3

1

7

6

0

Frequency

Frequency polygon for grouped age data

True/False

1. Frequency distributions are an effective way to present inferential statistics.


2. Categories in grouped data must be mutually exclusive.


3. Percentages are often used to describe characteristics of samples.


4. The total number of subjects in a sample is represented by the symbol n.

TEST YOUR KNOWLEDGE 13-2

How did you do? 1. F; 2. T; 3. T; 4. F

336 CHAPTER 13 What Do the Quantitative Data Mean?