Question 1

Which of the following best describes the distribution shown in Figure (a) of the first image (Bell-Shaped (Normal) Distribution)?

Accepted Answer

The frequencies start low, increase to a maximum, and then decrease, forming a symmetric shape.

Question 2

A frequency distribution is constructed with 7 classes. The minimum data value is 12 and the maximum is 68. What is the class width?

Accepted Answer

$$\frac{68 - 12}{7} = 8 ($$rounded up)

Question 3

Which of the following graphs is most appropriate for displaying the distribution of categorical data such as types of stolen boats?

Accepted Answer

Pareto chart

Question 4

What is the main advantage of using a relative frequency histogram instead of a regular histogram when comparing two data sets with different sample sizes?

Accepted Answer

Relative frequencies allow for direct comparison regardless of sample size.

Question 5

Which of the following statements about pie charts is correct according to the study materials?

Accepted Answer

Pie charts are not recommended because they waste ink and lack an appropriate scale.

Question 6

Given the following class limits: 10-19, 20-29, 30-39, what is the class width?

Accepted Answer

$$20 - 10 = 10$$

Question 7

Which of the following is a feature of a dotplot?

Accepted Answer

It is usually possible to recreate the original list of data values.

Question 8

A time-series graph is most useful for which of the following purposes?

Accepted Answer

Revealing trends in data over time.

Question 9

Which of the following is NOT a characteristic of a normal distribution?

Accepted Answer

The distribution is skewed to the right.

Question 10

What does a scatterplot with no distinct pattern indicate about the relationship between two variables?

Accepted Answer

There is no correlation between the variables.

Question 11

If a histogram shows a longer tail on the right side, how is the data described?

Accepted Answer

Positively skewed (skewed to the right)

Question 12

Which of the following is a potential problem with pictographs?

Accepted Answer

They can exaggerate differences due to the use of area or volume.

Question 13

What is the formula for calculating the relative frequency for a class?

Accepted Answer

$$	ext{Relative frequency} = \frac{	ext{frequency for a class}}{	ext{sum of all frequencies}}$$

Question 14

Which of the following best describes a cumulative frequency distribution?

Accepted Answer

Each class frequency is the sum of the frequencies for that class and all previous classes.

Question 15

Which of the following is a feature of a stemplot?

Accepted Answer

It retains the original data values.

Question 16

What is the main purpose of a regression line in a scatterplot?

Accepted Answer

To represent the line that best fits the data points.

Question 17

Which of the following is true about correlation?

Accepted Answer

Correlation does not imply causation.

Question 18

If the sum of the frequencies in a relative frequency distribution is 1000 and the frequency for a class is 250, what is the percentage for that class?

Accepted Answer

$$\frac{250}{1000} 	imes 100\% = 25\%$$

Question 19

Which of the following is a distinguishing feature of a Pareto chart compared to a regular bar graph?

Accepted Answer

Bars are arranged in descending order of frequency.

Question 20

What is the formula for finding the class midpoint?

Accepted Answer

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

Exploring Data with Tables and Graphs: Introductory Statistics Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards