A Sociologist Develops a Test to Measure Attitudes About Public

question 21

Multiple Choice

A sociologist develops a test to measure attitudes about public transportation.She wishes to compute a 90% confidence interval for the mean score on this test.It is believed that the standard deviation for these test scores will be 21.How many people should be given the test in order to achieve a margin of error of 10?

• A)11
• B)14
• C)12
• D)15
• E)13

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Definitions:

Savings

The portion of disposable income not spent on current consumption but set aside for future use, often in a deposit account or as investments.

Investment

The action or process of allocating resources, usually money, with the expectation of generating an income or profit.

Aggregate Demand

The total demand for goods and services within an economy at a given overall price level and in a given time period.

Conclusions

The summary of findings or the final arguments presented after an analysis or discussion.