Question 1

A researcher is interested in testing whether a new teaching method improves memory retention in college students. She randomly assigns students to either the new method or the traditional method and measures their test scores after one month. In this experiment, what is the independent variable (IV)?

Accepted Answer

The type of teaching method used (new vs. traditional)

Question 2

Which of the following best describes the purpose of random assignment in an experiment?

Accepted Answer

To ensure that each participant has an equal chance of being placed in any experimental group, reducing the risk of confounding variables

Question 3

A psychologist wants to study the relationship between hours of sleep and academic performance. She finds a positive correlation between the two variables. Which of the following is the most accurate interpretation of this result?

Accepted Answer

There is an association between hours of sleep and academic performance, but causation cannot be determined from correlation alone

Question 4

A study finds that students who use mnemonic devices score higher on memory tests. To ensure that the results are not due to participants' natural memory abilities, the researcher uses random assignment. What is the main benefit of using random assignment in this context?

Accepted Answer

It ensures that differences in memory test scores are likely due to the use of mnemonic devices rather than pre-existing differences in memory ability

Question 5

Which of the following is an example of a confounding variable in an experiment testing the effect of caffeine on reaction time?

Accepted Answer

Participants' natural sleep levels, which could affect reaction time independently of caffeine

Question 6

A double-blind study is designed to test a new drug. Which of the following best describes a double-blind study?

Accepted Answer

Both the participants and the researchers interacting with them are unaware of who is receiving the drug or the placebo

Question 7

Which of the following best illustrates the hindsight bias?

Accepted Answer

Believing you could have predicted the outcome of an event after it has already happened

Question 8

A researcher wants to ensure that her sample accurately reflects the characteristics of the population from which it is drawn. Which type of sample should she use?

Accepted Answer

Representative sample

Question 9

In a study, the operational definition of 'memory' is the number of words correctly recalled from a list after 10 minutes. Why is it important to use operational definitions in research?

Accepted Answer

They ensure that variables are measured objectively and consistently

Question 10

A psychologist is interested in how children develop language skills by observing them in their natural classroom environment without interfering. Which research method is she using?

Accepted Answer

Naturalistic observation

Question 11

Which of the following best describes the placebo effect?

Accepted Answer

A real change in symptoms after receiving a treatment with no active ingredients, due to the belief in the treatment's efficacy

Question 12

A study uses a sample of only gym members to investigate exercise habits among adults. What is the main limitation of this sampling method?

Accepted Answer

It may not accurately represent the exercise habits of the general adult population

Question 13

Which of the following is an example of overconfidence bias?

Accepted Answer

Believing you know more about a topic than you actually do, leading to errors in judgment

Question 14

A meta-analysis is most useful for which of the following purposes?

Accepted Answer

Combining the results of multiple studies to draw broader conclusions about a topic

Question 15

In an experiment, the group that does NOT receive the experimental treatment and serves as a baseline for comparison is called the:

Accepted Answer

Control group

Question 16

A researcher finds a correlation coefficient of $$r = -0.85$$ between stress levels and hours of sleep. What does this indicate?

Accepted Answer

There is a strong negative relationship between stress and sleep

Question 17

Which of the following best describes a hypothesis in scientific research?

Accepted Answer

A testable prediction about the relationship between two or more variables

Question 18

A psychologist uses a survey to collect data on students' study habits and grades. What type of measure is she using?

Accepted Answer

Quantitative measure

Question 19

Which of the following is a key advantage of using a double-blind study design?

Accepted Answer

It reduces bias from both participants and researchers, increasing the reliability of the results

Question 20

A study finds that people who eat breakfast regularly tend to have lower body mass index (BMI). Which of the following statements is most accurate based on this finding?

Accepted Answer

There is a correlation between eating breakfast and lower BMI, but causation cannot be determined

Experimental Design and Research Methods in General Biology

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