[Objective: Interpret the Z Test Statistic] Suppose the Janitor Tests

Multiple Choice

[Objective: Interpret the z test statistic] Suppose the janitor tests 300 light bulbs and finds that 33 bulbs are defective. The calculated test statistic is z=1.21. Select the appropriate interpretation of the test statistic.

A) A test statistic of 1.21 is 1.21 standard deviations greater than the mean (between 1 and 2 ) indicating that the result is not significant at a level of 0.01 using a one-sided alternative hypothesis.
B) A test statistic of 1.21 is 1.21 standard deviations greater than the mean (between 1 and 2 ) indicating that the result could be significant using a two-sided alternative hypothesis.
C) A test statistic of -1.21 is 1.21 standard deviations less than the mean (between 1 and 2 ) indicating that the result could be significant at a level of 0.01 using a one-sided alternative hypothesis.
D) A test statistic of 1.21 is 1.21 standard deviations less than the mean (between 1 and 2 ) indicating that the result is not significant.