Q: If 10 out of 22 aphasics have anomic aphasia, what is the class percentage for anomic aphasia?

$$(\frac{10}{22}) \times 100 = 45.5\%$$

Q: If a pie chart is constructed for the aphasia data, what angle (in degrees) should the slice for conduction aphasia occupy?

$$360 \times \frac{7}{22} = 114.5^\circ$$

Q: If 57 patients received the drug and 57 did not, what is the class percentage for each group?

$$(\frac{57}{114}) \times 100 = 50\%$$

Question 1

Which of the following best describes a qualitative variable as used in the aphasia study?

Accepted Answer

A variable that can only be classified into categories, such as type of aphasia.

Question 2

Given the aphasia data, what is the class relative frequency for Broca’s aphasia?

Accepted Answer

$$\frac{5}{22}$$

Question 3

How is the class percentage for conduction aphasia calculated from the data?

Accepted Answer

$$(\frac{7}{22}) 	imes 100$$

Question 4

Which graphical method would best display the proportion of each type of aphasia in the sample?

Accepted Answer

Pie chart

Question 5

A Pareto diagram is different from a standard bar graph because:

Accepted Answer

It arranges the bars in descending order of height.

Question 6

In the cardiac drug study, what is the class frequency for patients who experienced both complications?

Accepted Answer

6

Question 7

If 10 out of 22 aphasics have anomic aphasia, what is the class percentage for anomic aphasia?

Accepted Answer

$$(\frac{10}{22}) 	imes 100 = 45.5\%$$

Question 8

Which of the following is NOT a valid class for the qualitative variable COMP in the cardiac study?

Accepted Answer

Blood pressure

Question 9

A bar graph for the type of aphasia uses which of the following for the height of each bar?

Accepted Answer

Class frequency, class relative frequency, or class percentage

Question 10

If the cumulative percent for 'Broca’s' aphasia is 68.2%, what does this value represent?

Accepted Answer

The percentage of subjects with either anomic or Broca’s aphasia

Question 11

Which of the following best describes the difference between class frequency and class relative frequency?

Accepted Answer

Class frequency is a count; class relative frequency is a proportion.

Question 12

In the cardiac drug study, what is the class relative frequency for patients who experienced no complications?

Accepted Answer

$$\frac{79}{114}$$

Question 13

A researcher wants to compare the distribution of complications between patients who received the drug and those who did not. Which graphical method is most appropriate?

Accepted Answer

A side-by-side bar graph

Question 14

If a pie chart is constructed for the aphasia data, what angle (in degrees) should the slice for conduction aphasia occupy?

Accepted Answer

$$360 	imes \frac{7}{22} = 114.5^\circ$$

Question 15

Which of the following statements is true regarding the use of cumulative percent in qualitative data analysis?

Accepted Answer

It helps to understand the proportion of observations up to and including a given class.

Question 16

A hospital administrator wants to know the most common complication after coronary bypass surgery. Which summary statistic should she use?

Accepted Answer

Class frequency

Question 17

If 57 patients received the drug and 57 did not, what is the class percentage for each group?

Accepted Answer

$$(\frac{57}{114}) 	imes 100 = 50\%$$

Question 18

Which of the following is a correct interpretation of a bar graph for the COMP variable in the cardiac study?

Accepted Answer

The height of each bar represents the number of patients in each complication category.

Question 19

A researcher wants to display the distribution of a qualitative variable with four categories. Which graphical method is NOT appropriate?

Accepted Answer

Histogram

Describing Qualitative Data: Frequency, Relative Frequency, and Graphical Methods

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