Question 1

Suppose psychologists find that redheaded people get a lower mean score on some IQ test than do other people. What can we conclude about the possible bias of this test, or what additional information would we need before drawing a conclusion?

Accepted Answer

The fact that redheaded people get a lower mean score on the IQ test does not necessarily mean that the test is biased against them. There could be various other factors affecting their performance on the test, such as socio-economic status, education level, or cultural background. To determine whether the test is biased, we need to test whether redheaded people do better or worse than their test scores predict based on these other factors.

Question 2

If you want to predict the grades for a group of first-year graduate students in physics, you can generally predict better from their GRE verbal scores than from their GRE quantitative scores. The main explanation for this observation is that

Accepted Answer

The main reason you can predict the grades of first-year graduate students in physics better from their GRE verbal scores than from their GRE quantitative scores is that physics graduate students tend to have less variation in their quantitative scores (since high quantitative skills are a prerequisite for the field) and more variation in their verbal scores. This variation in verbal scores can then be more predictive of differences in academic performance.

Question 3

Graduate Record Exam (GRE) scores are reported in a verbal score and a quantitative score. For graduate students in physics the __________ scores have the highest predictive validity; for graduate students in English __________ scores have the highest predictive validity.

Accepted Answer

Verbal scores have the highest predictive validity for graduate students in English, while quantitative scores have the highest predictive validity for graduate students in physics.

Question 4

A group of 2-year-old infants are selected for a special program because their IQ scores are very low. Five years later, most of them have improved. One possible explanation is that the special program produced great benefits. Another explanation is that

Accepted Answer

The phenomenon known as regression to the mean suggests that extreme scores on a measure are likely to be less extreme on a subsequent administration of the measure. This means that individuals whose IQ scores were very low at age 2 would be expected to have higher scores at age 7 simply due to chance. Therefore, the improvement in IQ scores may not be solely attributed to the special program.

Question 5

To determine whether or not an IQ test is biased against some minority group, we need to determine

Accepted Answer

To determine bias, we need to see if the test underpredicts the performance of minority group members, which would indicate that the test is not accurately measuring their abilities.

Question 6

Which of the following would NOT necessarily indicate that a particular IQ test was biased?

Accepted Answer

While a group scoring lower on average may suggest bias, it is not necessarily indicative of bias. It is possible that the group genuinely has lower cognitive abilities. Factors such as cultural and socio-economic differences can also contribute to discrepancies in scores. However, options B, C, and D all involve the test itself being biased towards one group, which would indicate an issue with the test's validity.

Question 7

To determine whether an IQ test is "biased" against members of some group, the key information is whether or not the members of that group, on average

Accepted Answer

The key information for determining bias is whether the test scores accurately predict outcomes, such as school performance, for all groups. If a group does better in school than their test scores predict, it suggests the test may be biased against them.

Question 8

Rusty believes that IQ tests are biased against redheaded people. To find out whether his charge is correct, psychologists would have to determine

Accepted Answer

The answer of Rusty believes that IQ tests are biased...

Question 9

Suppose it is determined that a particular IQ test is biased against recent immigrants to the United States or Canada. This means that an immigrant child with an IQ score of 100 will probably

Accepted Answer

The answer of Suppose it is determined that a particular...

Question 10

Which of the following is impossible?

Accepted Answer

A test with low reliability means that the results are not consistent and may vary widely upon repeated administration. A test with high predictive validity means that it accurately predicts performance in a certain area or outcome. It is logically impossible for a test with low reliability to have high predictive validity because the inconsistent results make it difficult to accurately predict anything.

Question 11

A group of infants are identified as having low IQs, although it is admitted that infant IQ scores have low reliability. Five years later, most of these children have higher IQs than before. What is the most reasonable and most parsimonious conclusion?

Accepted Answer

The fact that infant IQ scores have low reliability suggests that the initial test results may not have been accurate reflections of the infants' intelligence. It is also known that IQ scores can increase with age and experience, so it is possible that the infants simply matured and acquired new skills in the five-year period. Option A is less likely since IQ test results are standardized to account for changes in difficulty over time. Option C is not supported by research evidence. Option D is possible but not necessary to explain the results. Therefore, the most reasonable and parsimonious conclusion is that the increase in IQ scores is due to random fluctuations in unreliable data.

Question 12

How can researchers determine whether or not an IQ test is biased against a certain group of people?

Accepted Answer

Researchers can determine bias by comparing actual performance outcomes, like school performance, against what the test predicts. If a group performs better than their test scores suggest, it may indicate bias in the test.

Question 13

Someone develops a new test of mechanical abilities. Which of the following (if true) would be the strongest evidence that the test is biased against women?

Accepted Answer

The strongest evidence of bias in the test against women would be if women who score the same as men on the test are actually better at mechanical tasks (D). This suggests that the test underestimates women's mechanical abilities relative to men's, indicating a bias in how the test measures those abilities.

Question 14

Sinistrella believes that the standard IQ tests are biased against left-handed people. Which of the following would support her charge?

Accepted Answer

The answer of Sinistrella believes that the standard IQ tests...

Question 15

Why do quantitative scores on the Graduate Record Exam (GRE) have higher predictive validity for graduate students in English than verbal scores do?

Accepted Answer

The predictive validity of quantitative scores for graduate students in English is higher because these students tend to have uniformly high verbal scores, making it harder to differentiate among them based on verbal abilities alone. Quantitative scores offer additional, useful variance.

Question 16

What does it mean to say that a test is biased against members of a particular group?

Accepted Answer

A test is biased against members of a particular group if it systematically underestimates the abilities or knowledge of that group compared to other measures or tasks, not necessarily due to the intention of the test creators or the subjective reactions of the group members.

Question 17

To determine whether some IQ test is biased against some group, the most decisive information would be

Accepted Answer

If a group consistently performs better in other contexts than their test scores suggest, it may indicate that the test is biased against them. This suggests that the test is not fully capturing their cognitive abilities, which could be related to cultural or socioeconomic factors. Therefore, this is the most decisive information to determine whether an IQ test is biased against a group. The other options do not necessarily provide clear evidence of bias.

Question 18

Which of the following would be evidence that an IQ test is biased against women?

Accepted Answer

If women with the same IQ score as men perform better academically, it suggests the test underestimates women's abilities, indicating bias.

Question 19

A group of children are selected because they scored extremely high (over 145) on an IQ test. Psychologists test their performance again 4 years later only to find that most of them scored a bit lower the second time than the first time. Which of the following is the most likely (and the most parsimonious) explanation?

Accepted Answer

The most parsimonious explanation is that the drop in scores represents a random fluctuation in data based on a test with less than perfect reliability. IQ test scores can vary from one testing period to another, and no test is 100% reliable. Therefore, it is not uncommon for individuals' scores to fluctuate over time. Option A is a possibility, but without additional evidence, it is not the most likely explanation. Option B is an unfounded assumption, and option C is incorrect as IQ scores do not necessarily decline over time for all individuals.

Question 20

An IQ test is "biased" against members of some group if the people in that group

Accepted Answer

If people in a group do better in school than their scores predict, it suggests that the test does not accurately measure their abilities, indicating bias.

Quiz 9: Intelligence