A sample of five measurements, randomly selected from a normally distributed population, resulted in the following summary statistics: x = 4.8,s = 1.3 Test the null hypothesis that the mean of the population is 6 against the alternative hypothesis, mu < 6. use alpha =.05. Test the null hypothesis that the mean of the population is 6 against the alternative hypothesis, mu 6. Use alpha =.05 Find the observed significance level for each test.