![]() To find the critical value for a left-tailed probability in the table above, simply use the table column for 1 − α. The most common left-tailed test is the test of a single variance when determining whether a population’s variance or standard deviation is less than a certain value. ![]() If you want to perform a two-tailed or left-tailed test, you’ll need to make a small additional calculation. You should use this table for most chi-square tests, including the chi-square goodness of fit test and the chi-square test of independence, and McNemar’s test. The table provided here gives the right-tail probabilities. If the critical value is larger than the sample’s chi-square, they can reject the null hypothesis. The security team can now compare this chi-square critical value to the Pearson’s chi-square they calculated for their sample. The table cell where the row and column meet is your critical value.Įxample: Finding the critical value in the tableWhere the row for df = 3 and the column for α =.Find the column corresponding to your chosen significance level. The significance levels (α) are listed along the top of the table. ![]() Find the table row corresponding to the degrees of freedom you calculated.
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