![]() Standard Normal Cumulative Probability Table. the standard normal distribution with a mean (). Multiply this number by 100 to get percentages. To find the critical t value, one needs to compute the inverse cumulative PDF of the T distribution. Then go to the x axis to find the second decimal number (0.07 in this case). Find the first two digits on the y axis (0.6 in our example). Finding a corresponding probability is fairly easy. ![]() For George’s example we need to use the 2nd table as his test result corresponds to a positive z-score of 0.67. If a z-score calculation yields a negative standardized score refer to the 1st table, when positive used the 2nd table. If you noticed there are two z-tables with negative and positive values. standard normal distribution table) comes handy. Therefore: Z score = (700-600) / 150 = 0.67 Now, in order to figure out how well George did on the test we need to determine the percentage of his peers who go higher and lower scores.
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