$$\frac{\text{upper class limit} + \text{lower class limit}}{2}$$

Question 1

Which of the following best describes a variable in a statistical study?

Accepted Answer

A characteristic of the individual to be measured or observed.

Question 2

Which of the following is an example of qualitative data?

Accepted Answer

The blood group types of students.

Question 3

Discrete data is best described as:

Accepted Answer

Data that consists of numbers representing counts and can be listed.

Question 4

Which of the following is NOT a type of qualitative data?

Accepted Answer

Continuous data

Question 5

A statistic is:

Accepted Answer

A numerical measure that describes an aspect of a sample.

Question 6

Which chart is most appropriate for comparing a part to the whole?

Accepted Answer

Pie chart

Question 7

In a bar graph, which of the following statements is TRUE?

Accepted Answer

Bars should not touch each other.

Question 8

Single value grouping is most suitable for:

Accepted Answer

Discrete data with a small number of distinct values.

Question 9

What is the formula for the class midpoint in limit grouping?

Accepted Answer

$$\frac{	ext{upper class limit} + 	ext{lower class limit}}{2}$$

Question 10

A histogram differs from a bar graph in that:

Accepted Answer

The bars in a histogram touch each other.

Question 11

Which graphical display is most useful for showing the relative positions of data in a set or for comparing two or more data sets?

Accepted Answer

Dot plot

Question 12

In a stem-and-leaf diagram, the 'stem' consists of:

Accepted Answer

All but the rightmost digit of the observation.

Question 13

Which of the following shapes describes a distribution with two peaks?

Accepted Answer

Bimodal

Question 14

A distribution is said to be right skewed if:

Accepted Answer

The tail is on the right side.

Question 15

Which of the following is a real-world example of continuous data?

Accepted Answer

The height of students measured in centimeters.

Question 16

If you are given the following class limits for a frequency distribution: 20–29, 30–39, 40–49, what is the midpoint of the class 30–39?

Accepted Answer

$$\frac{39 + 30}{2} = 34.5$$

Question 17

Which of the following statements about modality is correct?

Accepted Answer

A bimodal distribution has two peaks.

Question 18

When constructing a frequency distribution for qualitative data, what does the relative frequency represent?

Accepted Answer

The proportion of observations in each category.

Question 19

Which method of grouping is most appropriate when there are too many distinct values to use single value grouping for quantitative data?

Accepted Answer

Limit grouping

Question 20

A researcher collects the number of pets owned by each student in a class. Which type of data is this?

Accepted Answer

Discrete quantitative data

Chapter 2: Organizing Data – Study Notes for Statistics

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