1. Validity: refers to whether a test can truly and accurately reflect the degree of the tested thing. Simply put, it can be understood as a question of whether the test is accurate, so it is also the most important indicator to measure the quality of a test. The connotation and status of validity are often examined in the form of multiple-choice questions and judgment questions with connotation or status, which need everyone to understand and remember;
2. Reliability: The consistency, stability and reliability of the same test results have been measured many times, and the concept connotation, especially the reliability, is often classified as validity in the exam, which needs to be grasped emphatically. At the same time, the influence of test length (that is, the number of test questions) on test reliability is often investigated in the exam, so the relationship between the two needs to be mastered by everyone. Generally speaking, increasing the test length of similar questions and increasing the representativeness of questions are effective ways to improve reliability. Of course, we should also avoid the phenomenon that the test questions are too long, which will interfere with the reliability of the test.
Understand the meaning of reliability and validity, we can infer the relationship between them, mainly including the following points:
If the efficiency is high and the reliability is accurate, the stability and reliability of eight positive measurement results can be achieved.
High reliability does not necessarily guarantee the stability and accuracy of high-efficiency measurement results. For example, taking the third grade math test paper to test the math level of the third grade children in primary school, the test results are 0 many times, which is highly reliable, but it cannot be said that the third grade children in primary school have no math ability;
Low validity is not necessarily consistent with high reliability;
The measurement results with low reliability and some low validity fluctuate greatly and are unstable, so the accuracy of the results will not be very high.
The above is a description of the relationship between reliability and validity. You can test your understanding and understanding of the content through the test questions:
1. Teacher Zhang mistakenly distributed the math final exam questions of grade two to the primary school students of grade five, which led to poor final exam results of grade five students, indicating that this exam ().
A. High reliability B. Low reliability C. High efficiency D. Low validity
Combined with the questions, it is obvious that this exam can't truly reflect the real mathematics level of fifth-grade students, which shows that the validity is low, so D is chosen.
The above is about reliability and validity. I hope today's content can help you learn!