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It also provides a table of z-scores from the mean to z or z to infinity. It also provides a table of critical values for two-tailed tests at various levels of significanceĭetermine the area of mean to z for a given z-scoreĭetermine the area of z to infinity for a given z-scoreĭetermine a z-score given the area of mean to zĭetermine a z-score given the area of z to infinity This spreadsheet contains calculators that determine the critical r for a given alpha and that determine the p-value for a given r. Table of critical chi square values for various degrees of freedom at various levels of alpha also used with Mahalanobis tests

The calculators display expected frequencies and graphs of the proportions of responses across either columns or rows. This spreadsheet contains calculators that produce chi square values and p-values from observed frequencies for six common (1x2, 1x3, 2x2, 2x3, 3x2, and 3x3) contingency tables. A hypothesis test for the difference in two proportions is sometimes known as a two proportion z-test because of the use of a z-score in analyzing results. It also provides a Student's t table of critical values for a two-tailed test and for a one-tailed test at various levels of significance In a difference in proportions hypothesis test, we calculate the probability that we would observe the difference in sample proportions (p 1 - p 2). This spreadsheet contains calculators that determine a critical t-value for a given alpha and that determine a probability for a given t-value. Click on the name of a calculator to download it