How much combustion efficiency should a homeowner expect
Chapter 10, Problem 125SE(choose chapter or problem)
How much combustion efficiency should a homeowner expect from an oil furnace? The EPA states that or higher is excellent,
to
is good,
to
is fair, and below
is poor. A home-heating contractor who sells two makes of oil heaters (call them
and
) decided to compare their mean efficiencies by analyzing the efficiencies of 8 heaters of type
and 6 of type
. The resulting efficiency ratings in percentages for the 14 heaters are shown in the accompanying table.
Type A |
Type B |
72 |
78 |
78 |
76 |
73 |
81 |
69 |
74 |
75 |
82 |
74 |
75 |
69 |
|
75 |
a Do the data provide sufficient evidence to indicate a difference in mean efficiencies for the two makes of home heaters? Find the approximate -value for the test and interpret its value.
b Find a confidence interval for \(\left(\mu_{A}-\mu_{B}\right)\) and interpret the result.
Equation transcription:
Text transcription:
(mu{A}-\mu{B})
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