A company attempts to evaluate the potential for a new bonus plan by selecting a sample of 4 salespersons to use the bonus plan for a trial period. The weekly sales volume before and after implementing the bonus plan is shown below. (For the following matched samples, let the difference "d" be d = after - before.) 
a.State the hypotheses.
b.Compute the test statistic.
c.Use Alpha = .05 and test to see if the bonus plan will result in an increase in the mean weekly sales.
Definitions:
Early Adulthood
The life stage typically ranging from ages 20 to 40, characterized by increased independence, responsibility, and personal development.
Heredity and Environment
The dual factors that influence an individual's development and characteristics; heredity refers to genetic inheritance, while the environment encompasses all external factors.
Cultural Practices
These are the patterns of behavior accepted by a society that reflect the beliefs, customs, and traditions of its people.
Behavioral Similarity
The degree to which individuals in a group exhibit the same behaviors or patterns of action.
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