Question 1

Which of the following best describes a population in statistics?

Accepted Answer

All individuals or items of interest in a statistical study.

Question 2

A researcher wants to know the average height of all students at a university. She measures the height of 100 randomly selected students. What is the sample in this scenario?

Accepted Answer

The 100 students whose heights were measured.

Question 3

Which of the following variables is quantitative?

Accepted Answer

Number of siblings

Question 4

A survey asks respondents to rate their satisfaction on a scale of 1 (very dissatisfied) to 5 (very satisfied). What level of measurement is this?

Accepted Answer

Ordinal

Question 5

Which of the following is an example of a ratio level of measurement?

Accepted Answer

Height in centimeters

Question 6

A medical researcher divides patients into two groups: one receives a new drug, the other receives a placebo. What is the group receiving the placebo called?

Accepted Answer

Control group

Question 7

Which of the following best describes a double-blind experiment?

Accepted Answer

Neither the subjects nor the experimenters know which group receives the treatment.

Question 8

A frequency distribution is used to:

Accepted Answer

Summarize data by showing the number of observations in each category or interval.

Question 9

Given the following data set: 2, 4, 4, 6, 8, what is the median?

Accepted Answer

$$4$$

Question 10

Which of the following graphs is most appropriate for displaying the distribution of a categorical variable?

Accepted Answer

Bar chart

Question 11

A stem-and-leaf plot is best used for:

Accepted Answer

Displaying the distribution of a small set of quantitative data.

Question 12

If a data set is skewed to the right, which of the following is true?

Accepted Answer

The mean is greater than the median.

Question 13

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

Accepted Answer

It is skewed to the right.

Question 14

A cumulative frequency distribution shows:

Accepted Answer

The total number of observations up to and including each class interval.

Question 15

Which of the following best describes the mode of a data set?

Accepted Answer

The value that appears most frequently in the data set.

Question 16

A researcher collects data on the number of hours students study per week and their exam scores. Which type of graph would best display the relationship between these two variables?

Accepted Answer

Scatterplot

Question 17

Which of the following is a potential source of bias in a survey?

Accepted Answer

Leading questions

Question 18

If the mean of a data set is $$50$$ and the standard deviation is $$5$$, what is the z-score for a value of $$60$$?

Accepted Answer

$$2$$

Question 19

Which of the following best describes an outlier?

Accepted Answer

A value that is much higher or lower than most of the other values in a data set.

Question 20

A pie chart is most appropriate for displaying:

Accepted Answer

The distribution of a categorical variable.

Practice Test Study Guide: Introduction to Statistics & Exploring Data (Chapters 1 & 2)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드