Where p represents the difficulty of the exam
H represent the number of people in high posts is a test that
L represents the number of people in the low post is a test that
N is the total number of people in the high and low values of difficulty. Will be from 0:00 to 1:00 if p approaches 1.00, the test is simple, but if the p-value close to 0 indicates that the test is difficult. Interpretation p values using the following criteria p = .00 - .19 means the test is too hard p = .20 - .39 represents a difficult test p = .40 - .59 represents the difficulty of adequately test p =. 0.60 to 0.80 represents a relatively simple test p = .81 - 1.00 means the test is too simple discrimination (r) refers to the ability of the test to identify or distinguish the difference between the candidates of different achievement. together In order to predict or indicate differences in ability, as evident by people with mild loss. Assuming that the people should take it. Those who do not should take the baby is finding the discrimination. The efficiency of the test To classify students into two groups: high and low. The symbols are "r" in the formula r = (HL) / (N / 2) where r represents the discriminative power of the test H represent the number of people in high posts in exam questions that L represents the number of people in low. answer questions on a test, then N is the total number of people in the group and the low values of r ranged from -1.00 to 1.00, if the value is positive, indicating that the response is higher than the low, but if the value is - to show that the high post. is less than the minimum Interpretation of the following criteria: r is the r = .40 to represents a very high discriminative value r = .30 - .39 represents a high discriminative power of r = .20 - .29 means to power. by some value r = .00 - .19 represents a low discriminatory power , r = negative means no discrimination sources of information: www.rta.mi.th/630a0u/qa_amds/file_qa_amds/km1.pdf searched. As of January 22, 2556.
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