Use the Traditional Method to Test the Given Hypothesis $\alpha = 0.05$

Essay

Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected.
-At the $\alpha = 0.05$ significance level test the claim that a population has a standard deviation of $20.3$ . A random sample of 18 people yields a standard deviation of $27.1$ .