A professor gives his class a final examination that he knows from years of experience yields a population mean of 84. His present class of 24 obtains a mean of 88 and a standard deviation of 8. Is he correct in assuming that the performance of the most recent class differs significantly from that of other classes? Use a one-tailed test here since the professor assumes that the class will score higher.

• Null hypothesis:
• Alternative hypothesis:
• Statistical test:
• Significance level (alpha = .05)
• Critical region for rejecting null hypothesis:
• Calculate the statistic:
• Decision: