$$\text { TABLE 10-11 }$$ A Corporation Randomly Selects 150 Salespeople and Finds That 66

question 102

Multiple Choice

$$\text { TABLE 10-11 }$$ A corporation randomly selects 150 salespeople and finds that 66% who have never taken a self-improvement course would like such a course. The firm did a similar study 10 years ago in which 60% of a random sample of 160 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let ×and × represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively.
-Referring to Table 10-11, the company tests to determine at the 0.05 level whether the population proportion has changed from the previous study. Which of the following is most correct?

• A) Reject the null hypothesis and conclude that the proportion of employees who are interested in a self-improvement course has changed over the intervening 10 years.
• B) Do not reject the null hypothesis and conclude that the proportion of employees who are interested in a self-improvement course has increased over the intervening 10 years.
• C) Reject the null hypothesis and conclude that the proportion of employees who are interested in a self-improvement course has increased over the intervening 10 years.
• D) Do not reject the null hypothesis and conclude that the proportion of employees who are interested in a self-improvement course has not changed over the intervening 10 years.

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Definitions:

Spurious Relationships

A connection between two variables that appears causal but is actually caused by a third variable.

Experimental Situation

The setting experimental subjects are placed in. This setting may be a threat to external validity if it does not reflect external reality.

External Validity

Relates to whether an experiment has in fact captured the external world that the researcher is investigating.

Attrition

The loss of participants during the course of a study, which can impact the study's outcomes and generalizability.