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HW10 - An Evaluation of Fuel Efficiency
Transcript of HW10 - An Evaluation of Fuel Efficiency
a look at what factors have an impact on HWY MPGs
click on one of the circular or rectangular frames and and then add your example inside that one frame.
prepare a two-sample hypothesis test for the mean to evaluation highway fuel efficiency.
Since we need to compare TWO samples, I will compare Manual & Automatic transmission types...
It looks like manual transmissions types see slightly higher highway fuel efficiency...
when we take a closer look at the data, my claim seems to be strongly supported...
...based on the direction of my claim, this is a ONE tailed test...
based on the large sample size(s), this is a z-test
the OBS value is MUCH larger than the CRIT value,
and the p-value is REALLY small,
so we can reject the null!
here is what you would actually type in to calculate the OBS value:
Manual transmission types really DO achieve higher fuel efficiency on the highway.
this example completed by Dr. Edmonds
...be sure to translate your Excel problem into an interactive format.
(don't just upload a screenshot of the template)
Are Females more Open to new Ideas than males?
I compared the combined MPG of diesel and gas powered vehicles and found that diesel powered vehicles have a higher combined MPG than gas powered vehicles.
I chose to explore the relationship between engine displacement and the combined MPG rating. There are many engine varieties, therefore I chose to use only the six most popular displacements.
It would appear that as engine displacement goes up, the combined MPG rating goes down. We will need to utilize data to prove this claim.
µ1 < µ2
Engines with a 3.5-liter displacement
have a lower combined MPG average than engines with a 3.0-liter displacement.
µ1 < µ2
Engines with a 3.5-liter displacement have a lower
combined MPG average than engines with a 3.0-liter displacement.
Reviewing the normal distribution curve, it can be seen that the absolute value of Zobs is greater than the Zcrit. Our data exceeded the critical measure (Zcrit), which proves the null statement false. From this comparison it would indicate that engine displacement does have an inverse relationship with combined average MPG.
The P value is smaller than the desired α-level error tolerance. The possibility of a Type II Error is at or below the acceptable level.
Electric cars are more fuel efficient on highway MPG than gas cars
Gas cars are more fuel efficient on highway MPG than electric cars
*team work makes the dream work
Conclusion: We accept the Null - Two wheel drive vehicles are more fuel efficient on the highway than four wheel drive vehicles. The data shows that on average 2 wheel drive vehicles get approx. 5 more MPG than 4 wheel drive vehicles.
We can accept the null because OBS> CRIT
Drive Type Vs. Hwy MPG
Hyp Test Results
The data seems to strongly support the hypothesis that states two wheel drive vehciles get better gas mileage than four wheel drive vehicles
The test statistic is greater than the critical measure and the p value is much lower than the alpha level. Because of this the Hypothesis seems to be strongly supported
The conclusion makes sense. The data supports our claim and the hypothesis test verifies our data is acceptable. Logically the conclusion makes sense it takes more Horsepower to turn four wheels than two. Four wheel drive vehicle usually are larger and have higher displacement engines than two wheel drive vehicles.
Null: 2WD vehicles do not have higher Greenhouse Gas Scores than 4WD vehicles
Alternative: 2WD vehicles have higher Greenhouse Gas Scores than 4WD vehicles
OBS > Critical?
P-value < a-level
I accept the alt that 2WD vehicles have higher Greenhouse Gas Scores than 4WD vehicles
Air Pollution by Vehicle Class
Accept the alternative stating: station wagons do have a higher air pollution average than pickups
By: Ian Schreffler
Vehicle Type VS City MPG
For this homework assignment I will look at the difference in gas mileage between gasoline and diesel automobiles.
The purpose of this test is to compare different Vehicle Types to their City MPG. The goal is to determine out of the two vehicle types chosen which has the better City MPG
The data appears to show that
diesel autos get better overall MPG's
when compared to gasoline vehicles.
It appears that small cars have a better City MPG than Small SUV's. These will be the two vehicle types chosen
Null: Small Cars do not have a greater city MPG than small SUV's
Alternative: Small Cars have a greater City MPG than small SUV's
Closer Look at the Data
Two Sample Mean Test
This is the remaining data needed to complete the test
The results from the test
Two Sample Test
Please note that this was a z test since the sample size is above 30 and this is a one tail test being that this is comparing one subject being greater than another subject
since the test statistic is greater than the critical measure and the P-value is less than alpha we accept the alternative. The alternative states that small cars have a greater city MPG than small SUV's. Thus consumers that value city MPG should purchase a small car instead of a small SUV
This was a one tailed, z-test
since the sample size was
greater than 30
Small Car vs. Standard SUV Hwy MPG
The purpose of this test is to compare highway MPG between Small Car and Standard SUV. It will be determined which car class has better highway MPG of the two.
Null: Highway MPG is less for small SUVs
Alternative: Highway MPG is not less for small SUVs
Conclusion: Small car has better highway MPG than a standard SUV.
My goal was to determine if diesel 4WD vehicles had better Combined MPG than gas 4WD vehicles. Since the absolute value of the test statistics (observed) was greater than the critical measure and the p-value was very small compared to the alpha level, the Null was rejected and the Alternate accepted. I determined that there was no difference in the combine MPG of 4WD diesel and gas powered vehicles.
Kurt W. Eisele, PhD