We estimate the unknown standard deviation for 
by the _________ .
Definitions:
Average Profit
The mean financial gain computed by dividing the total profit by the number of units sold or transactions, providing insight into overall profitability.
Degrees of Freedom
The number of independent values or quantities which can be assigned to a statistical distribution without violating any constraints.
T Distribution
A probability distribution that is used to estimate population parameters when the sample size is small and the population variance is unknown.
T-Test Statistic
A statistical measure used to assess the significance of the difference between the mean values of two groups.
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