Find the Confidence Interval Specified

question 20

Multiple Choice

Find the confidence interval specified. Assume that the population is normally distributed.
-Thirty randomly selected students took the calculus final. If the sample mean was 93 and the standard deviation was 13.3, construct a 99% confidence interval for the mean score of all students.

• A)88.87 to 97.13
• B)86.31 to 99.69
• C)87.02 to 98.98
• D)86.33 to 99.67

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Definitions:

Corporate Tax Rate

The percentage of a corporation's profit that is paid to the government as tax.

Debt Ratio

An indicator measuring a corporation's use of borrowing, obtained by dividing the sum of all liabilities by the sum of all assets.

Debt Financing

The means of raising capital through the sale of bonds, bills, or notes to individuals or institutions, in return for lending money to the borrowing entity.

Net Operating Income

A measure of a company's profitability from its regular business operations, excluding taxes and interest.