Hypothesis Tests About the Difference Between the Means of 2 Populations: SmallSample Case Can we conclude, using a .05 level of significance, that the milespergallon (mpg) performance of M cars is greater than the milespergallon performance of J cars?
Example:
Ali Motors
11
Hypothesis Tests About the Difference Between
the Means of 2 Populations:
SmallSample Case
1
= mean mpg for the population of M cars
2
= mean mpg for the population of J cars
•
Hypotheses
H
0
:
1

2
= 0
H
a
:
1

2
> 0
Example:
Ali Motors