A group of people took a new IQ test twice. Nearly all of those who did well the first time they took it also did well the second time. Nearly all those who did poorly the first time did poorly again the second time. Therefore, this test has __ reliability and __ validity.
a. high...high
b. low...low
c. high...unknown
d. unknown...high
I chose answer C. because in order to be reliable, the test scores are repeated. But this question was somewhat difficult to read, so i was wondering if this was the correct answer.
I think you are right with the C answer although I'm not sure of the reliability of the question. Note that the question simply says, "Nearlly all of those who did well the first time......" but it doesn't give a percentage and one wonders just what nearlly all means. Nearlly all is a realitive term. Also there is no mention of the number of test takers in each group. It would mean more for a group of 1000 than a group of 5.
Reliability is consistency among measurements.
Validity is determining whether a test measures what it is supposed to measure, usually using some outside criterion.
This should help you make your own decision. Thanks for asking.
Your interpretation of the question and reasoning behind choosing answer C (high reliability and unknown validity) is understandable. However, I would like to provide you with a more precise explanation to help you better understand the correct answer.
Reliability and validity are two different concepts used to evaluate the quality of a test.
Reliability refers to the consistency and stability of a test. In this case, since the group of people who performed well on the test the first time also performed well the second time, and vice versa for those who did poorly, it suggests that the test has high reliability. The scores are consistent and predictable across repeated administrations.
Validity, on the other hand, refers to the accuracy and meaningfulness of a test in measuring what it claims to measure. The information given in the question does not provide any indication or evidence about the test's validity. Therefore, the validity of the test remains unknown, and it would not be appropriate to assume it has high validity based on the information provided.
Considering this explanation, the correct answer would be:
a. high...high
The test shows high reliability based on the consistent performance of individuals across the two administrations. However, no information is provided to determine the test's validity.