An investigator has developed a new technique to teach eighth-grade students the characteristics of positive and negative numbers. She wishes to evaluate the technique by using it to teach group A. Group B, which receives conventional instruction on positive and negative numbers, serves as a control. She needs a mathematics achievement test to measure the post-training performance of the two groups. She considers the XYZ Test of Mathematics Achievement. In checking the test manual, she finds that when this test was administered to a sample of eighth-grade students at the end of the academic year, the test scores correlated .72 with their end-of-year grades in mathematics. No other validity evidence was given in the test manual.
a. What type of validity evidence was given in the test manual?
b. What type of validity evidence is most relevant to the proposed study, and why?

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The Answer of An investigator has developed a new technique to teach eighth-grade students the characteristics of positive and negative numbers. She wishes to evaluate the technique by using it to teach group A. Group B, which receives conventional instruction on positive and negative numbers, serves as a control. She needs a mathematics achievement test to measure the post-training performance of the two groups. She considers the XYZ Test of Mathematics Achievement. In checking the test manual, she finds that when this test was administered to a sample of eighth-grade students at the end of the academic year, the test scores correlated .72 with their end-of-year grades in mathematics. No other validity evidence was given in the test manual.
a. What type of validity evidence was given in the test manual?
b. What type of validity evidence is most relevant to the proposed study, and why?

An Investigator Has Developed a New Technique to Teach Eighth-Grade