Question 1

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

Accepted Answer

A population is the entire group of interest, while a sample is a subset selected from that group.

Question 2

Which of the following is an example of inferential statistics?

Accepted Answer

Using a sample mean to estimate the average age of all students at a university.

Question 3

A researcher collects heart rate data from 100 participants during a stress test. What is the term for a single heart rate measurement from one participant?

Accepted Answer

Datum

Question 4

Which level of measurement allows for meaningful ratios and has a true zero point?

Accepted Answer

Ratio

Question 5

A company wants to compare the average sales across three regions. Which type of data is most appropriate for this analysis?

Accepted Answer

Quantitative data

Question 6

Which sampling method involves dividing the population into subgroups based on a characteristic and then randomly sampling from each subgroup?

Accepted Answer

Stratified sampling

Question 7

In an experiment testing a new medication, what is the purpose of a placebo control group?

Accepted Answer

To measure the effect of the medication compared to no treatment.

Question 8

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

Accepted Answer

Selecting only volunteers who respond to an online survey.

Question 9

If a variable is measured on an ordinal scale, which of the following statements is true?

Accepted Answer

The data can be ranked, but differences between values may not be meaningful.

Question 10

A researcher wants to study the effect of phone use on enjoyment of social interactions. Which is the independent variable in this study?

Accepted Answer

Access to phone

Question 11

Which formula would you use to calculate the mean of a data set with $$n$$ observations $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

$$\frac{\sum_{i=1}^{n} x_i}{n}$$

Question 12

Which of the following is NOT a step in the process of designing a statistical study?

Accepted Answer

Ignore possible errors in the study.

Question 13

A researcher pairs subjects based on age and IQ before assigning them to treatment groups. What is this design called?

Accepted Answer

Matched pairs design

Question 14

Which type of study involves observing subjects without manipulating any variables?

Accepted Answer

Observational study

Question 15

Which of the following is a quantitative variable?

Accepted Answer

Number of clicks on a website

Question 16

If a temperature is measured in Celsius, what is the level of measurement?

Accepted Answer

Interval

Question 17

Which sampling method involves selecting every $$kth $$member from a list after a random start?

Accepted Answer

Systematic sampling

Question 18

What is the main advantage of using random assignment in experimental design?

Accepted Answer

It controls for confounding variables by evenly distributing them across groups.

Question 19

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

Accepted Answer

Neither the subjects nor the experimenters know which group the subjects are in.

Question 20

A researcher wants to simulate the results of rolling a die 1000 times using a computer program. What type of study is this?

Accepted Answer

Simulation study

Introduction to Statistics: Key Concepts, Data Types, and Study Design Chapter. 1

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