The degrees of freedom for the test statistic in a test of a contingency table is (r − 1)(c − 1)where r is the number of rows in the table,and c is the number of columns.

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This is a true statement. The degrees of freedom for a test of a contingency table is calculated using the formula (r-1)(c-1), where r is the number of rows in the table and c is the number of columns. This formula takes into account the number of categories being compared and the constraints imposed by the row and column totals of the table.

The Degrees of Freedom for the Test Statistic in a Test