A Random Sample of 30 Executives from Companies with Assets

question 78

Multiple Choice

A random sample of 30 executives from companies with assets over $1 million was selected and asked for their annual income and level of education. The ANOVA comparing the average income among three levels of education rejected the null hypothesis. The mean square error (MSE) was 243.7. The following table summarized the results: When comparing the mean annual incomes for executives with a high school education or less and those with an undergraduate degree, the 95% confidence interval shows an interval of 11.7 to 42.7 for the difference. This result indicates that __________________.

• A) there is no significant difference between the two incomes
• B) the interval contains a difference of zero
• C) executives with an undergraduate degree earn significantly more than executives with a high school education or less
• D) executives with an undergraduate degree earn significantly less than executives with a high school education or less

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Definitions:

Speed of Light

The speed at which light waves propagate through different mediums; in a vacuum, it is approximately 299,792 kilometers per second.

Wavelength

A measure of the distance between two identical points (such as peaks) in consecutive cycles of a wave.

P Orbital

A type of atomic orbital that has a dumbbell shape and can hold up to two electrons, with orientations along the x, y, and z axes.

Electrons

Subatomic particles with a negative electric charge, orbiting the nucleus of an atom, involved in chemical bonds and electricity.