Testing a Single Mean
This section shows how to test the null hypothesis that the population mean is equal to some hypothesized value, using a very concrete example. In this example, all the main elements of hypothesis testing come in to play a role.
Testing a Single Mean
Answers
- The population standard deviation is known.
- The standard error of the mean is . You then find the probability of a sample mean more than from the population mean of . This is the probability outside and given a distribution with a mean of and a standard deviation of . The probability is .0455.
- Make sure you divide by .
- You divide by the square root of .
- You divide by the standard error of the mean to get .
- You use degrees of freedom.