In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day,the following information is given: 
Based on this information,the upper limit for a 95 percent confidence interval estimate for the true population mean is:
Definitions:
Industry Groups
Categories of related businesses that produce or sell similar products or services and share similar market characteristics.
Optimal Capital Structure
The best mix of debt, preferred stock, and common equity that maximizes a company's stock price by balancing the costs and benefits of financing.
Weighted Average Cost of Capital
Weighted Average Cost of Capital (WACC) is a calculation of a company's cost of capital in which each category of capital is proportionately weighted.
Tax Shield
The reduction in income taxes that results from taking an allowable deduction from taxable income, such as interest on debt.
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