As part of a study designed to compare hybrid and similarly equipped conventional vehicles, a group tested a variety of classes of hybrid and all-gas model cars and sport utility vehicles (SUVs). Suppose the following data show the miles-per-gallon rating obtained for two hybrid small cars, two hybrid midsize cars, two hybrid small SUVs, and two hybrid midsize SUVs; also shown are the miles per gallon obtained for eight similarly equipped conventional models.
Class | Type | MPG |
---|---|---|
Small Car | Hybrid | 37 |
Small Car | Conventional | 28 |
Small Car | Hybrid | 44 |
Small Car | Conventional | 32 |
Midsize Car | Hybrid | 27 |
Midsize Car | Conventional | 23 |
Midsize Car | Hybrid | 32 |
Midsize Car | Conventional | 25 |
Small SUV | Hybrid | 27 |
Small SUV | Conventional | 21 |
Small SUV | Hybrid | 28 |
Small SUV | Conventional | 22 |
Midsize SUV | Hybrid | 23 |
Midsize SUV | Conventional | 19 |
Midsize SUV | Hybrid | 24 |
Midsize SUV | Conventional | 18 |
At the α = 0.05 level of significance, test for significant effects due to class, type, and interaction.
Find the value of the test statistic for class. (Round your answer to two decimal places.)
___________.
Find the p-value for class. (Round your answer to three decimal places.)
p-value = ____________.
Find the value of the test statistic for type. (Round your answer to two decimal places.)
______________.
Find the p-value for type. (Round your answer to three decimal places.)
p-value = __________.
Find the value of the test statistic for interaction between class and type. (Round your answer to two decimal places.)
________________.
Find the p-value for interaction between class and type. (Round your answer to three decimal places.)
p-value =____________.
Applying two way ANOVA on above data:
Source of Variation | SS | df | MS | F | P-value |
factor A | 441.25 | 3 | 147.08 | 24.01 | 0.000 |
factor B | 182.25 | 1 | 182.25 | 29.76 | 0.001 |
Interaction | 19.25 | 3 | 6.42 | 1.05 | 0.423 |
Within | 49 | 8 | 6.13 | ||
Total | 691.75 | 15 |
value of the test statistic for class =24.01 |
p-value =0 |
Because the p-value ≤ α = 0.05, class is significant. |
value of the test statistic for type =29.76 |
p-value =0.001 |
Because the p-value ≤ α = 0.05, type is significant. |
)value of the test statistic for interaction =1.05 |
p-value = 0.423 |
Because the p-value > α = 0.05, interaction between class and type is not significant. |
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