Question: A sample of size14 was selected from a normal population and used to test the null hypothesis that the population mean was equal to18 vs.

A sample of size14 was selected from a normal population and used to test the null hypothesis that the population mean was equal to18 vs. the alternative hypothesis that the population mean was not equal to 18. Analysis of the sample produced a test statistic of t = 9.00. For this t-test, the degrees of freedom are df = __________ .

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