A test of spelling ability is given to a random sample of 10 students before and after they completed a spelling course.The mean score before the course was 119.60 and after the course the mean score was 130.80.The standard deviation of the difference was 16.061.Test the hypothesis at 
= .05
Definitions:
User Cost
The economic cost of using a good or service, including the opportunity cost of not having the good available for future use.
Extraction Cost
The expenses associated with the removal of resources or raw materials from the earth, such as mining, drilling, or quarrying.
Quantity of Gold Bars
The quantity of gold bars represents the physical amount of gold, measured in bars, that an entity possesses or trades.
User Cost
The cost of using a good or service, including the cost of foregone opportunities.
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