Question 1

Which of the following best describes the difference between a population and a sample in statistics?

Accepted Answer

A population is the complete collection of all individuals to be studied, while a sample is a subcollection selected from the population.

Question 2

A pharmaceutical company conducts a study on its new drug and reports a 95% success rate. What is the most important question to ask about the source of the data?

Accepted Answer

Is the source objective or biased?

Question 3

Which of the following is an example of a voluntary response sample?

Accepted Answer

A news show asks viewers to call in with their opinions.

Question 4

Suppose a study finds that as ice cream sales increase, drowning deaths also increase. Which statistical concept is most relevant when interpreting this result?

Accepted Answer

Correlation does not imply causation

Question 5

A researcher finds that a new treatment for tuberculosis has a probability of success much less than 5% by chance alone. What does this indicate?

Accepted Answer

The result is statistically significant.

Question 6

Which of the following is an example of continuous quantitative data?

Accepted Answer

A person's height

Question 7

Which level of measurement is represented by baking temperatures (e.g., 350°F, 400°F, 325°F)?

Accepted Answer

Interval

Question 8

A study divides a population into men and women, then randomly selects individuals from each group. What type of sampling is this?

Accepted Answer

Stratified sampling

Question 9

In the Salk vaccine experiment, children were randomly assigned to receive either the vaccine or a placebo. What is the main advantage of this randomization?

Accepted Answer

It creates groups that are similar, reducing bias.

Question 10

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

Accepted Answer

Neither the subjects nor the experimenters know who receives the treatment or placebo.

Question 11

A researcher selects every 5th car passing a checkpoint for inspection. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 12

Which of the following is a non-sampling error?

Accepted Answer

Recording incorrect data due to a typo

Question 13

A survey is conducted by interviewing people who are easy to reach. What type of sampling is this?

Accepted Answer

Convenience sampling

Question 14

Which of the following is an example of data at the nominal level of measurement?

Accepted Answer

Social security numbers

Question 15

A pollster randomly selects polling stations and surveys all voters at those stations. What sampling method is being used?

Accepted Answer

Cluster sampling

Question 16

Which of the following best describes the difference between statistical significance and practical significance?

Accepted Answer

Statistical significance means the result is unlikely to occur by chance; practical significance means the result is important in real life.

Question 17

A researcher wants to estimate the average income of all residents in a city. She randomly selects 100 residents and calculates their mean income. What is the mean income of the 100 residents called?

Accepted Answer

A statistic

Question 18

Which of the following is an example of discrete quantitative data?

Accepted Answer

The number of cars in a parking lot

Question 19

A study records the dates of major historical events (e.g., 1066, 1492, 1644). What is the level of measurement?

Accepted Answer

Interval

Question 20

Which of the following best describes replication in an experiment?

Accepted Answer

Repeating the experiment on many individuals to see the effects of treatments.

Introduction to Statistics: Foundations, Data Types, and Sampling Methods

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