A random sample of 28 students' final exam scores in Statistics I, revealed a mean of 63.39. Assume a population standard deviation of 25.17. It is assumed that the grades follow a normal distribution. The teacher believes that on the average his students' final exams are lower than C (70%). Test the hypothesis at the 5% significance level. Perform a critical value test. Hypotheses: Ho: % Ha: % de de Test statistic: Round to the nearest thousandth: Critical value(s): Round to the nearest thousandth: z = Decision: