Question: For testing a hypothesis about mean, population standard deviation is not known. If a sample of size 20 is used for the analysis that has

For testing a hypothesis about mean, population standard deviation is not known. If a sample of size 20 is used for the analysis that has a mean of 28 and sample standard deviation of 6, what degrees of freedom for the t-distribution should be used in the calculations? Type the correct numerical answe

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