Problem: Your company wants to improve sales. Past sales data indicate that the average sale was $100 per transaction. After training your sales force, recent sales data (taken from a sample of 25 salesmen) indicates an average sale of $130, with a standard deviation of $15. Did the training work? Test your hypothesis at a 5%alpha level.

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Illustrative Example: 1. A manufacturing firm claims that the average income of their employees per day is Php325. A random sample of 25 employees were tested and found to have a mean daily income of Php310 with a standard deviation of 4.5. Test hypothesis that u = 325 against alternative u