Question 1

Which of the following best describes the main purpose of a histogram?

Accepted Answer

To display the frequencies or relative frequencies of possible outcomes for a quantitative variable using bars.

Question 2

A distribution is said to be skewed to the right if:

Accepted Answer

The right tail is longer than the left tail.

Question 3

Which graphical summary would be most appropriate for displaying the number of students in each major at a university?

Accepted Answer

Bar graph

Question 4

Given the following sodium content data for cereals: 0, 70, 125, 125, 140, 150, 170, 170, 180, 200, 200, 210, 210, 220, 220, 230, 250, 260, 290, 290. What is the frequency of cereals with sodium content between 120 and 159 mg?

Accepted Answer

$$4$$

Question 5

Which of the following is NOT a key feature to identify when interpreting a histogram?

Accepted Answer

Correlation

Question 6

A time plot is most useful for:

Accepted Answer

Displaying how a variable changes over time.

Question 7

Which of the following statements about pie charts is TRUE?

Accepted Answer

The size of each slice is proportional to the percentage of observations in that category.

Question 8

A stem-and-leaf plot is particularly useful because:

Accepted Answer

It retains the original data values and displays the shape of the distribution.

Question 9

If a histogram of exam scores is symmetric, what does this imply about the distribution of scores?

Accepted Answer

The left and right sides of the histogram are mirror images of each other.

Question 10

Which of the following is an example of an outlier?

Accepted Answer

A value that falls far above or below the bulk of the observations.

Question 11

A bar graph is called a Pareto chart when:

Accepted Answer

The categories are ordered by their frequency from tallest to shortest bar.

Question 12

Which type of graph would be most appropriate for summarizing the distribution of household incomes in a large city?

Accepted Answer

Histogram

Question 13

Suppose you have a data set of the number of hours students watch TV per week, and the histogram is skewed to the right. What does this indicate?

Accepted Answer

Most students watch a low to moderate number of hours, but a few watch much more.

Question 14

Which of the following steps is NOT part of constructing a histogram?

Accepted Answer

Order the categories alphabetically.

Question 15

A dot plot is most useful for which type of data set?

Accepted Answer

A small data set of quantitative values.

Question 16

If a distribution is bimodal, what does this mean?

Accepted Answer

The distribution has two distinct peaks.

Question 17

Which of the following best describes a categorical variable?

Accepted Answer

An observation that belongs to a category, such as eye color or province.

Question 18

In a time plot showing the number of internet users from 1995 to 2001, what pattern would indicate a trend?

Accepted Answer

A consistent increase or decrease in the number of users over time.

Question 19

Which of the following is a quantitative variable?

Accepted Answer

The number of push-ups a person can do in a row.

Question 20

If a histogram of life spans is skewed to the left, what does this indicate about the data?

Accepted Answer

Most people live to older ages, with relatively few younger ages in the long left tail.

Lesson 3.2

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드