Question 1

Research in which the same group is tested and retested over a period of years is a

Accepted Answer

A longitudinal study involves testing the same group of individuals over a prolonged period of time. This contrasts with a cross-sectional study, which involves examining different groups of people at one point in time, and a scatterplot and regression toward the mean, which are statistical methods and not types of research designs.

Question 2

If half the students at Quincy University have blue eyes,which of the following events is most probable?

Accepted Answer

The answer of If half the students at Quincy University...

Question 3

As the size of a sample ________,the size of the standard deviation is most likely to ________.

Accepted Answer

As the size of a sample increases, the sample more closely approximates the population, leading to a decrease in the standard deviation because the variability in the sample is likely to decrease as it better represents the entire population.

Question 4

The average scores of two samples taken from the same population are most likely to differ if

Accepted Answer

The answer of The average scores of two samples taken...

Question 5

To test for age differences in intelligence,at the beginning of the school year a researcher gave the same mathematics test to groups of children who were 8,10,12,and 14 years of age.This procedure best illustrates a

Accepted Answer

A cross-sectional study involves testing individuals from different age groups at the same time. This is exactly what the researcher did by giving the same mathematics test to children of different ages at the beginning of the school year. Therefore, the procedure best illustrates a cross-sectional study.

Question 6

Unusual ESP subjects who defy chance when first tested nearly always lose their "psychic powers" when retested.This decline is best explained in terms of

Accepted Answer

Regression toward the mean. This is because the first test may have been an outlier or extreme score that is unlikely to be repeated on a retest, as the subject's true ability is likely to be closer to the mean.

Question 7

Statistical significance refers to whether research

Accepted Answer

Statistical significance refers to the likelihood that the research findings are not due to chance variations. It does not address the causal relationship between variables, random assignment of participants, or support for previous findings.

Question 8

With use of cross-sectional studies to assess the effect of aging on adults' mental abilities,it is especially important to consider the impact of ________ between generations.

Accepted Answer

Educational differences between generations need to be considered because they can have a confounding effect on the relationship between aging and mental abilities. For example, younger adults may have higher education levels than older adults, and education has been found to positively affect cognitive function. Failing to control for educational differences could lead to inaccurate conclusions about the effect of aging on mental abilities.

Question 9

Which of the following correlations between annual income and education level would best enable you to predict annual income on the basis of level of education?

Accepted Answer

A correlation of +0.50 indicates a moderate to strong positive relationship between annual income and education level. This means that as education level increases, annual income is also likely to increase. Therefore, this correlation would best enable you to predict annual income based on level of education. A correlation of +0.05 or +0.10 would indicate a weaker positive relationship, while a correlation of -0.01 would indicate a very weak negative relationship (if any) between the two variables.

Question 10

Faustin,a member of his school's golf team,has an opportunity to play against a nationally acclaimed professional golfer.How many holes of golf should Faustin choose to play with the professional in order to maximize his own slim chances of winning?

Accepted Answer

The answer of Faustin,a member of his school's golf team,has...

Question 11

After his property was vandalized by a small group of teenagers,Mr.Mahmood concluded that most teenagers are irresponsible and delinquent.Mr.Mahmood ought to be reminded that accurate generalizations depend on

Accepted Answer

Accurate generalizations require the observation of representative samples, meaning that the sample should be chosen in a way that accurately represents the entire population. Drawing conclusions based on the behavior of a small group of teenagers who vandalized his property is not a representative sample and may be skewed. Therefore, Mr. Mahmood ought to be reminded that accurate generalizations depend on observing representative samples. Regression toward the mean, constructing a scatterplot, and selecting samples from a skewed population are not relevant in this scenario.

Question 12

Which of the following correlations expresses the strongest degree of relationship between two variables?

Accepted Answer

The correlation of -0.67 indicates a strong negative relationship between the two variables. The closer a correlation is to -1 or +1, the stronger the relationship between the variables.

Question 13

Students who score much higher on an exam than they usually do can reasonably anticipate ________ scores when they are retested.

Accepted Answer

The answer of Students who score much higher on an...

Question 14

We can most accurately estimate the mean of a population if

Accepted Answer

The accuracy of estimating the mean of a population is dependent on the size of the sample and its variability. A larger sample size reduces the effect of sampling error, resulting in a more accurate estimate of the population mean. Additionally, a low variability within the sample means that the sample mean is more representative of the actual population mean. Therefore, a sample that is large in size and low in variability is the best choice for accurately estimating the mean of a population.

Question 15

Which statistical phenomenon refers to the tendency for extraordinary or unusual events to be followed by more ordinary events?

Accepted Answer

Regression toward the mean refers to the statistical phenomenon in which unusual events tend to be followed by more ordinary events. This concept is important to keep in mind when interpreting data and avoiding the tendency to attribute cause and effect to chance fluctuations.

Question 16

Kiska displayed the relationship between college students' self-esteem and their feelings of depression on a scatterplot.The points on the scatterplot are most likely clustered in a pattern that

Accepted Answer

A scatterplot showing the relationship between college students' self-esteem and their feelings of depression would likely show a negative correlation, where higher levels of self-esteem are associated with lower levels of depression, resulting in points that extend from the upper left (high depression, low self-esteem) to the lower right (low depression, high self-esteem).

Question 17

Although Soren once scored 37 points during a single high school basketball game,he was subsequently unable to beat or match this record no matter how hard he tried.His experience may be at least partially explained in terms of

Accepted Answer

Regression toward the mean suggests that extreme performance is often followed by more average performance. In this case, Soren's initial score of 37 points was likely an outlier and therefore more likely to be followed by scores closer to his average performance.

Question 18

Gene believes he is much more likely to win the state lottery if he chooses the numbers than if the numbers are randomly generated by a computer program.Gene's belief best illustrates

Accepted Answer

Gene's belief that he has more control over winning the lottery by choosing the numbers is an illusion of control. This is a cognitive bias in which individuals overestimate their ability to control events that are actually determined by chance or outside factors. Gene's belief is not supported by any evidence or causal relationship, making it an example of this bias.

Question 19

To compare verbal intelligence at different age levels,researchers tested and retested a group of children from the time they were 2 until they reached the age of 20.The researchers were clearly using a

Accepted Answer

A longitudinal study involves testing participants at different points in time to measure changes or stability in a particular variable. In this case, the researchers tested the same group of children at different ages, which fits the definition of a longitudinal study. Correlation coefficient measures the degree of association between two variables, cross-sectional study compares different groups at one point in time, and regression toward the mean refers to the phenomenon of extreme scores becoming less extreme with repeated measurements.

Question 20

Akira dreamed that a handsome young man she had met the previous day asked her for a date.When he actually did call for a date several days later,Akira concluded that dreams accurately predict future events.Her belief best illustrates

Accepted Answer

Akira's belief that her dream accurately predicted the future is an example of an illusory correlation, where a perceived relationship between two events is not actually present. In this case, her dream and the subsequent date appear to be related, but in reality, it was just a coincidence.

Quiz 16: Exploring the Role of Industrial-Organizational Psychology