Quiz: The Test Statistic

1. Which of these is an example of a test statistic?
a. the sample mean
b. the population mean
c. a z-score
2. The null hypothesis H0: μ = 12 will be rejected in favor of the alternative hypothesis Ha: μ > 12 at the α = 0.05 level if the test statistic z is greater than
a. 1.28
b. 1.65
c. 1.96
3. A test is conducted with the null hypothesis H0: μ = 10 vs. the alternative hypothesis Ha: μ < 10 at the α = 0.05 level. The test statistic is z = –1.75. The correct conclusion is
a. fail to reject the null hypothesis
b. reject the null hypothesis
c. only possible at the α = 0.01 level

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