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Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence level?

Identify one or two-tailed
States the Null and Alternative Hypothesis
States the Level of Significance
Calculates Test Statistic
Formulates Decision Rule
Makes a Conclusion

  • Hypothesis -

    You need to consult your statistics text for the methods involved. However, I will start you out.

    Since you are only concerned with whether the class (mean 2) scored higher, it is a one-tailed test.

    Ho: mean 1 = mean 2
    H1: mean 1 < mean 2

    I'll leave the rest to you.

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