Consider the following results for two samples randomly taken from two populations. 
a.What are the degrees of freedom for the t distribution?
b.At 95% confidence, compute the margin of error.
c.Develop a 95% confidence interval for the difference between the two population means.
Definitions:
Rate of Return
The earnings or losses realized from an investment for a certain period, presented as a proportion of the investment's original expenditure.
First Dividends
The initial distribution of earnings declared by a company to its shareholders.
Constant Dividend
A dividend policy in which a firm aims to distribute a fixed amount or a stable dividend to shareholders per share, unaffected by fluctuations in its earnings or profits.
Required Rate of Return
The minimum expected rate of return on an investment, deemed necessary to compensate for its risk.
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