... 20053.6.3.2 .The range The RANGE is the difference between the highest and the lowest scores, i.e. it is the highest value minus the lowest. The formula for the range of the reading test results ... matter. to find out whether or not the test satisfies the qualities of a good test. From there the test will measure the effectiveness of the teacher’s teaching. If the test is not a good one, ... measure. Or in other words, the test may be valid for some purposes, but not for others. For example, if the purpose of a test is to test ability to communicate in a foreign language, then it is...