A Study of 20 Students Showed That the Correlation Between

question 99

Multiple Choice

A study of 20 students showed that the correlation between the time spent writing a test and the number of hours studied the night before the test was 0.35. Using a level of significance equal to 0.05, which of the following statements is true?

• A) The sample correlation coefficient could be zero since the test statistic does not fall in the rejection region.
• B) The null hypothesis that the population mean is equal to zero should not be rejected, and we should conclude that the true correlation coefficient is zero.
• C) There is not enough statistical evidence to conclude that the true correlation coefficient is different from zero.
• D) The null hypothesis that the population variance is equal to zero should be rejected, and we should conclude that the true correlation coefficient is zero.
• E) None of these.

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Definitions:

Price Floor

A government or regulatory-imposed minimum price set for a particular good or service, below which it cannot be sold, often to protect producers or encourage production.

Surplus

The situation in which the quantity of a good or service supplied exceeds the quantity demanded at the existing price.

Price Ceiling

A price ceiling is a legal maximum price set by the government for certain goods or services to prevent prices from becoming prohibitively high.

Price Floor

A government-imposed minimum price charged on a product, below which that particular product cannot be supplied to the market.