Q: Convert the fraction $$\frac{3}{8} to a $$percent.

$$\frac{3}{8} = 0.375 \times 100 = 37.5\%$$

Q: What is the percentage of people who like Pepsi if 120 out of 400 people say they like it?

$$\frac{120}{400} = 0.3 \times 100 = 30\%$$

Question 1

Which of the following best describes a population in statistics?

Accepted Answer

The complete collection of ALL measurements or data being considered.

Question 2

A researcher wants to know the average weight of all students at a university. She collects data from every student. What type of data collection is this?

Accepted Answer

Census

Question 3

Which of the following is a major pitfall when analyzing data?

Accepted Answer

Reporting sample data instead of measured data

Question 4

A survey finds that 40% of 2,500 people prefer online classes. How many people prefer online classes?

Accepted Answer

$$0.40 	imes 2500 = 1000$$

Question 5

Which of the following best illustrates statistical significance?

Accepted Answer

A coin is flipped 100 times and lands on heads 98 times.

Question 6

Which of the following is an example of practical significance?

Accepted Answer

A new teaching method improves test scores by 20 points on average.

Question 7

A voluntary response sample is most likely to be:

Accepted Answer

Biased and unreliable

Question 8

Which of the following statements is TRUE regarding correlation and causation?

Accepted Answer

Correlation does not imply causation.

Question 9

Convert the fraction $$\frac{3}{8} to a $$percent.

Accepted Answer

$$\frac{3}{8} = 0.375 	imes 100 = 37.5\%$$

Question 10

A survey asks, 'Netflix is America’s most watched streaming service. What streaming service do you watch the most?' This is an example of:

Accepted Answer

Loaded question

Question 11

If 0.045 is converted to a percent, what is the result?

Accepted Answer

$$0.045 	imes 100 = 4.5\%$$

Question 12

Which scenario is most likely to result in missing data?

Accepted Answer

Surveying people about their weight.

Question 13

What is the percentage of people who like Pepsi if 120 out of 400 people say they like it?

Accepted Answer

$$\frac{120}{400} = 0.3 	imes 100 = 30\%$$

Question 14

Which of the following is NOT a potential pitfall in data analysis?

Accepted Answer

Using a census

Question 15

If you change 0.008 to a percent, what is the answer?

Accepted Answer

$$0.008 	imes 100 = 0.8\%$$

Question 16

A sample is best defined as:

Accepted Answer

A few members of the population.

Question 17

Which of the following is a correct way to convert 15% to a decimal?

Accepted Answer

$$15 \div 100 = 0.15$$

Question 18

A survey finds that 0.6% of 5,000 people have a rare allergy. How many people is this?

Accepted Answer

$$0.006 	imes 5000 = 30$$

Question 19

Which of the following is an example of nonresponse bias?

Accepted Answer

People refusing to respond who have different views of the world.

Section 1.1: Statistical and Critical Thinking – Introductory Statistics Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드