A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information. 
The point estimate for the difference between the means of the two populations is
Definitions:
Long-Run Cost Curve
A graph showing the lowest cost at which a firm can produce any given level of output in the long run, when all factors of production are variable.
Average Total Cost
The total cost of production (including fixed and variable costs) divided by the number of units produced, indicating the per-unit cost of production.
X-Inefficiency
Inefficiency in an organization's allocation of resources due to a lack of competitive pressure, often leading to higher costs and lower output.
Q22: In November 2018, 50,000 people living in
Q46: In the past, 35% of the students
Q52: A poll was taken this year asking
Q53: The contents of a sample of 26
Q54: In a situation where the dependent variable
Q56: A random variable that may take on
Q64: Given that z is a standard normal
Q70: For a lower tail test, the p-value
Q81: To calculate the residual, you would take<br>A)
Q93: The following estimated regression equation was developed