Q: Which of the following is the correct formula for calculating the mean of a set of scores $$x_1$$, $$x_2$$, ..., x_n$$?

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

Question 1

Which of the following best describes the main focus of the biopsychosocial model in psychology?

Accepted Answer

It integrates biological, psychological, and social factors in understanding mental processes and behavior.

Question 2

A researcher wants to study the effect of sleep deprivation on memory recall. She randomly assigns participants to either a sleep-deprived group or a control group and measures their performance on a memory test. In this experiment, what is the independent variable?

Accepted Answer

The amount of sleep participants receive

Question 3

Which of the following best illustrates the concept of 'nature vs. nurture' in psychology?

Accepted Answer

Investigating whether intelligence is more influenced by genetic inheritance or by environmental factors

Question 4

Which of the following is an example of a double-blind study?

Accepted Answer

Neither the participants nor the experimenters know which participants are receiving the treatment or the placebo.

Question 5

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

Accepted Answer

A precise description of how a variable is measured or manipulated in a study

Question 6

A psychologist is interested in the relationship between stress and immune function. She collects data by interviewing participants about their stress levels and measuring their white blood cell counts. What type of research design is she using?

Accepted Answer

Correlational

Question 7

Which of the following statements about reliability and validity is correct?

Accepted Answer

A test must be reliable in order to be valid.

Question 8

Which of the following best describes the function of neurotransmitters in the nervous system?

Accepted Answer

They transmit chemical signals across synapses between neurons.

Question 9

A researcher finds that as the number of hours students study increases, their exam scores also increase. Which type of correlation is this?

Accepted Answer

Positive correlation

Question 10

Which of the following is the correct formula for calculating the mean of a set of scores $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

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

Question 11

Which of the following best describes the function of the sympathetic nervous system?

Accepted Answer

It prepares the body for 'fight or flight' responses.

Question 12

Which of the following is an example of a hypothesis in psychological research?

Accepted Answer

If students sleep at least 8 hours before an exam, their test scores will be higher than those who do not.

Question 13

Which of the following best describes the difference between quantitative and qualitative research?

Accepted Answer

Quantitative research uses numerical data and statistical analysis, while qualitative research explores non-numerical data such as themes and narratives.

Question 14

Which of the following best describes the concept of 'generalizability' in research?

Accepted Answer

The ability to apply research findings to a larger population beyond the sample studied.

Question 15

Which of the following is a key contribution of Wilhelm Wundt to psychology?

Accepted Answer

He established the first psychology laboratory and is considered the 'father of experimental psychology.'

Question 16

A distribution of test scores is highly skewed to the right. Which measure of central tendency is most likely to be pulled in the direction of the skew?

Accepted Answer

Mean

Question 17

Which of the following best describes the process of transduction in sensation?

Accepted Answer

The process by which sensory receptors convert physical energy into neural signals.

Question 18

According to Weber's Law, which of the following equations best represents the relationship between the just noticeable difference (JND) and the original stimulus intensity $$I$$?

Accepted Answer

$$\displaystyle \frac{\Delta I}{I} = k$$

Question 19

Which of the following is a function of the endocrine system in the body?

Accepted Answer

Releasing hormones that regulate various bodily processes

Question 20

A patient suffers damage to the occipital lobe of the brain. Which of the following functions is most likely to be affected?

Accepted Answer

Vision

Foundations of Psychology: Key Concepts and Biological Bases

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