Question 1

Which of the following best describes the concept of 'operational definition' in psychological research?

Accepted Answer

A statement that outlines the procedures and specific measures used to record observations of a variable.

Question 2

A researcher wants to measure stress in university students. She uses a self-report questionnaire, a saliva cortisol test, and behavioral observation of fidgeting. Which characteristic of quality scientific research is she primarily addressing?

Accepted Answer

Using converging operations to increase objectivity and validity.

Question 3

Which of the following is an example of a positively skewed distribution?

Accepted Answer

A distribution where most students score low on a test, but a few score much higher, creating a long tail to the right.

Question 4

A psychologist is conducting a study on memory using two different versions of a test to ensure consistency. Which type of reliability is being assessed?

Accepted Answer

Alternate-forms reliability

Question 5

In an experiment, participants are randomly assigned to either view nature scenes or urban scenes, and their stress levels are measured afterward. What is the independent variable (IV) in this study?

Accepted Answer

The type of scene viewed (nature vs. urban)

Question 6

Which of the following is a key limitation of case studies in psychological research?

Accepted Answer

Their findings may not generalize to other people or situations.

Question 7

A researcher finds a correlation coefficient of $$r = -0.85$$ between hours of video game play and hours of sleep among teenagers. What does this indicate?

Accepted Answer

There is a strong negative relationship: as video game play increases, sleep decreases.

Question 8

Which of the following best illustrates the Hawthorne Effect in a psychological study?

Accepted Answer

Participants change their behavior because they know they are being observed.

Question 9

A study uses a double-blind design. What does this mean?

Accepted Answer

Both the participants and the researchers do not know who is in the experimental or control group.

Question 10

Which of the following is NOT a characteristic of quality scientific research?

Accepted Answer

Hypotheses that cannot be tested or disproven

Question 11

A researcher only reports data that supports her hypothesis and ignores data that contradicts it. This is an example of:

Accepted Answer

Biased data selection

Question 12

Which of the following best describes the purpose of random assignment in experimental research?

Accepted Answer

To balance confounding variables across experimental groups.

Question 13

A psychologist is interested in whether caffeine affects reaction time. She gives one group caffeinated coffee and another group decaf, then measures their reaction times. Which is the dependent variable (DV)?

Accepted Answer

The participants' reaction times

Question 14

Which of the following is a potential problem with using large sample sizes in hypothesis testing?

Accepted Answer

Large samples can make very small, trivial effects appear statistically significant.

Question 15

A study finds $$p \u003c 0.05$$ when comparing two groups. What does this mean in terms of statistical significance?

Accepted Answer

There is less than a 5% probability that the observed difference is due to chance.

Question 16

Which of the following best describes the difference between descriptive and experimental research?

Accepted Answer

Descriptive research answers 'what' is happening, while experimental research can determine cause-and-effect relationships.

Question 17

A researcher wants to ensure that participants' responses are not influenced by social desirability bias. Which technique would be most effective?

Accepted Answer

Ensuring anonymity of responses

Question 18

Which of the following is an example of a null hypothesis?

Accepted Answer

There is no difference in memory scores between students who nap and those who do not.

Question 19

Which formula represents the calculation of the mean for a set of $$n$$ scores $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

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

Question 20

A psychologist wants to study the relationship between stress and academic performance. She collects data from a large, diverse group of students and finds a correlation of $$r = 0.30. $$Which of the following is the best interpretation?

Accepted Answer

There is a moderate positive relationship between stress and academic performance.

Reading and Evaluating Scientific Research in Psychology: Key Concepts and Methods

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