Exhibit 9-2

question 110

Multiple Choice

Exhibit 9-2.The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership.The dealership has historically had 800 customers per day.The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750.Assume that the population standard deviation is 350. Refer to Exhibit 9-2.The value of the test statistic is ____________.

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Definitions:

Scientific Theory

A well-substantiated explanation of some aspect of the natural world, based on a body of evidence and repeatedly tested hypotheses.

Testable Explanation

A hypothesis that can be supported or refuted through experimentation or observation.

Hypothesis

A proposed explanation for a phenomenon, subject to further testing and experimentation.

Photosynthesis

The process by which green plants, algae, and some bacteria convert light energy and carbon dioxide into chemical energy in the form of glucose, releasing oxygen as a byproduct.