The manager of a company believes that differences in sales performance depend upon the salesperson's age. Independent samples of salespeople were taken and their weekly sales record is reported below. 
a.State the null and alternative hypotheses.
b.Test the null hypothesis at the 5% level.
Definitions:
Null Hypothesis
An initial assumption made for statistical analysis that suggests no significant effect or relationship exists between variables.
Proportion
A measure that represents a part of a whole as a fraction or percentage.
T Distribution
A probability distribution used in statistics for estimating population parameters when the sample size is small and the population variance is unknown.
Degrees of Freedom
The number of independent values or quantities that can be assigned to a statistical distribution or in the calculation of a statistic.
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