A Marketing Research Company Is Estimating Which of Two Soft

question 115

Multiple Choice

A marketing research company is estimating which of two soft drinks college students prefer. A random sample of 330 college students produced the following 95% confidence interval for the
Proportion of college students who prefer one of the colas: (.330, .469) . What additional
Assumptions are necessary for the interval to be valid?

• A)The sample was randomly selected from an approximately normal population.
• B)The population proportion has an approximately normal distribution.
• C)No additional assumptions are necessary.
• D)The sample proportion equals the population proportion.

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Definitions:

Standard Deviation

Standard deviation is a measure of the dispersion or variability of a set of data points, indicating how much the individual data points differ from the mean value.

Stand Alone Risk

The risk associated with a particular investment or project considered in isolation from the rest of the portfolio or company's operations.

Covariance

A measure of how two random variables change together, indicating the direction of their linear relationship.

Standard Deviation

A statistical measure of the dispersion or variability of a set of data points, indicating the degree to which individual data points differ from the mean.