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

question 56

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.

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Definitions:

Prototyping

An approach that defines an initial list of user requirements, builds a prototype system, and then improves the system in several iterations based on users’ feedback.

Ill-defined Problems

Refer to complex issues without clear solutions or boundaries, often encountered in real-world scenarios.

Real-world Entities

Refers to objects, events, and concepts that exist physically or logically in the world, and can include people, buildings, concepts, and more.

Rapid Iterations

An approach in project management and software development where processes are repeated in quick succession to allow for fast feedback and refinements.