Math 1431 – Spring 2003 – Test #3 – Practice
Question 4b Answer
  1. Identify the parameter: the parameter is the population mean, μ

  2. State the hypotheses:
    H0: μ = 25
    Ha: μ > 25
  3. Choose a test statistic: the test statistic is the z–statistic

  4. Use Z-Test on TI83:

    The P–value is 0.00735.

  5. Make a conclusion: When α = 0.05, the P–value ≤ α, so we reject H0 at the α = 0.05 significance level. Thus, the odor threshold of students are greater than trained wine tasters.