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## محاسبه پایایی پرسشنامه به روش کودر ریچارتسون

Example 1: A questionnaire with 11 questions is administered to 12 students.g.

Values range from 0 to 1. The values of pq are simply the product of the p and q values, with the sum given in cell M20.real-statistics.com/wp-content/uploads/2012/12/kuder-richardson-formula-20. A high value indicates reliability, while too high a value (in excess of . The results are listed in the upper portion of Figure 1.

The Kuder and Richardson Formula 20 test checks the internal consistency of measurements with dichotomous choices.jpg" alt="Kuder Richardson Excel" width="526" height="377" />

Figure 1 – Kuder and Richardson Formula 20 for Example 1

The values of p in row 18 are the percentage of students who answered that question correctly – e. It is equivalent to performing the split half methodology on all combinations of questions and is applicable when each question is either right or wrong. A correct question scores 1 and an incorrect question scores 0.

We can calculate ρKR20 as described in Figure 2.g. Determine the reliability of the questionnaire using Kuder and Richardson Formula 20. The values of q in row 19 are the percentage of students who answered that question incorrectly – e.com/reliability/kuder-richardson-formula-20/

.png" alt="Kuder Richardson formulas" width="329" height="135" />

برگرفته از:

http://www. The test statistic is

where

k = number of questions

pj = number of people in the sample who answered question j correctly

qj = number of people in the sample who didn’t answer question j correctly

σ2 = variance of the total scores of all the people taking the test = VARP(R1) where R1 = array containing the total scores of all the people taking the test. the formula in cell B18 is =B16/COUNT(B4:B15).

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