Use the Following Information to Answer the Question

question 39

Multiple Choice

Use the following information to answer the question. A janitor at a large office building believes that his supply of light bulbs has a defect rate that is different than the defect rate stated by the manufacturer. The janitor's null hypothesis is that the supply of light bulbs has a defect rate of p = 0.09 (the light bulb manufacturer's stated defect rate) . Suppose we do a hypothesis test with a significance level of 0.01. Symbolically, the null and alternative hypothesis are as follows: H₀: p = 0.09 and H_a: p > 0.09.
-Suppose the janitor tests 300 light bulbs and finds that 33 bulbs are defective. What value of the test statistic should he report? Round to the nearest hundredth.

• A)z = 1.21
• B)z = - 2.17
• C)z = 2.17
• D)z = - 1.21

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Definitions:

Single-subject Experiments

Research design in which interventions or treatments are applied to a single participant to observe the effects over time.

Correlational Study

A research approach that seeks to find out if there is a relationship between two or more variables through statistical analysis, without establishing a cause-and-effect link.

Causation

The relationship between cause and effect, where one event (the cause) is responsible for the occurrence of another event (the effect).

Experimental Study

An investigative approach that directly manipulates variables to determine cause-and-effect relationships.