Confidence Levels Allow the Researcher to Have Some Idea of How

question 40

Multiple Choice

Confidence levels allow the researcher to have some idea of how closely their samples reflect the parameter.Which of the following statements about confidence levels is true?

• A)If a simple random sample is used, probability theory suggests that researchers can be 95 percent sure the estimates of that sample fall within one standard error of the parameter.
• B)If a simple random sample is used, probability theory suggests that researchers can be 68 percent sure that estimates of that sample fall within two standard errors of the parameter.
• C)If a simple random sample is used, probability theory suggests that researchers can almost be positive (99+ percent)that estimates of that sample fall within three standard errors of the true value.
• D)If a simple random sample is used, probability theory suggests that researchers can be positive that sample mean is equivalent to population mean.

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Definitions:

Negative Exponential Distribution

A type of statistical distribution often used to model the time between independent events that happen at a constant average rate.

Average Arrival Rate

In queuing theory, the average number of units (customers, items, etc.) arriving at a service point or system per unit time.

Average Service Rate

A measure of how quickly a service provider or system can perform its intended function, typically evaluated over a period to assess efficiency.

Average Service Time

The average duration needed to complete a particular service or process.