Question 1

Which of the following best describes the purpose of descriptive statistics?

Accepted Answer

To summarize and organize data so it can be easily understood.

Question 2

A researcher collects data on the heights of 100 university students and wants to display the frequency of each height range. Which graphical method is most appropriate?

Accepted Answer

Histogram

Question 3

Given a data set with values: 2, 4, 4, 6, 8, what is the mean?

Accepted Answer

$$ \frac{2+4+4+6+8}{5} = 4.8 $$

Question 4

Which of the following is NOT a measure of central tendency?

Accepted Answer

Range

Question 5

A medical researcher wants to know if a new drug affects blood pressure. She randomly assigns 50 patients to receive the drug and 50 to receive a placebo. What type of study is this?

Accepted Answer

Experimental study

Question 6

If the probability of a patient recovering from a disease after treatment is 0.7, what is the probability that two randomly selected patients both recover?

Accepted Answer

$$ 0.7 	imes 0.7 = 0.49 $$

Question 7

Which of the following statements about the normal distribution is TRUE?

Accepted Answer

The mean, median, and mode are all equal.

Question 8

A sample of 25 students has a mean test score of 80 and a standard deviation of 10. What is the standard error of the mean?

Accepted Answer

$$ \frac{10}{\sqrt{25}} = 2 $$

Question 9

Which of the following is an example of a discrete random variable?

Accepted Answer

The number of cars passing through an intersection in an hour

Question 10

A fair six-sided die is rolled. What is the probability of rolling a number greater than 4?

Accepted Answer

$$ \frac{2}{6} = \frac{1}{3} $$

Question 11

Which of the following best describes the purpose of inferential statistics?

Accepted Answer

To make generalizations about a population based on sample data.

Question 12

A researcher wants to test if there is a significant difference in average test scores between two teaching methods. Which statistical test should she use?

Accepted Answer

Two-sample t-test

Question 13

If the null hypothesis is true, what is the probability of making a Type I error?

Accepted Answer

$$ \alpha $$

Question 14

Which of the following is a characteristic of a binomial distribution?

Accepted Answer

Each trial has only two possible outcomes.

Question 15

A contingency table is used to:

Accepted Answer

Display the relationship between two categorical variables.

Quiz Assignment Instructions and Chapter Overview for Statistics

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드