An educational psychologist administered a number of ability measures to 120 14-year olds.The measures included an IQ test, and tests of mathematics, spelling, and general verbal ability as well as a test of the amount of time it took the students to learn material from the new curriculum.The correlation table is shown below: Based on the output which of the following statements is false?
A)Learning time is an unreliable measure.
B)By Cohen's standards spelling ability is strongly related to verbal ability.
C)Scores on all of the measures are caused by IQ.
D)The lower correlations for learning time from left to right across the table reflect the effects of truncated range.
E)All of the above.

Question

An educational psychologist administered a number of ability measures to 120 14-year olds.The measures included an IQ test, and tests of mathematics, spelling, and general verbal ability as well as a test of the amount of time it took the students to learn material from the new curriculum.The correlation table is shown below:  Based on the output which of the following statements is false?
A)Learning time is an unreliable measure. 
B)By Cohen's standards spelling ability is strongly related to verbal ability. 
C)Scores on all of the measures are caused by IQ. 
D)The lower correlations for learning time from left to right across the table reflect the effects of truncated range. 
E)All of the above.

Quizplus · Accepted Answer

- A) This statement is not supported by the correlation table, as there is no correlation coefficient provided for learning time with any of the other measures. Therefore, it is not possible to determine whether learning time is unreliable or not based on this information alone.
- B) This statement is true, as the correlation coefficient between spelling ability and verbal ability is 0.81, which is considered a strong positive correlation by Cohen's standards.
- C) This statement is false, as the correlation coefficients between IQ and the other measures (mathematics, spelling, and verbal ability) are not all equal or close to 1. Instead, they range from 0.37 to 0.65, which indicates that IQ accounts for a moderate amount of the variance in these measures.
- D) This statement is not supported by the correlation table, as the coefficients for learning time do not show a consistent decrease from left to right across the table. Therefore, it is not possible to determine whether truncated range is a factor affecting the correlations based on this information alone.
- E) This statement is false, as statements B, C, and D are either true or not supported by the given information. Therefore, at least one of the statements is false, and the correct answer is E.

An Educational Psychologist Administered a Number of Ability Measures to 120