INTRODUCTION
The following case study documents descriptive statistics done after surveys were done by a consumer research organization on the performance of automobiles produced by a Detroit manufacturer. These surveys were designed to evaluate a wide variety of products and services that were available to consumers in order to take a look at consumer satisfaction with the performance of the automobiles. The goal of this study is to identify ways to avoid early transmission problems and to gain full customer satisfaction.
OBJECTIVE
The objective is to learn more about the transmission failures by analyzing the samples used by Metropolitan of actual transmission repairs provided by a transmission repair firm in the Detroit
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∝ = .05, √50=7.07107, σ 24898.71544 7.07107 = 3521.21
0.5 ~0.025 = 1.96
73340 ± 3521.21 (1.96)
73340 +6901.5716 = 80241.5716
73340 – 6901.5716 = 66438.4284
95% Confident Interval = 66438 to 80241
The 95% confidence interval for the population mean is 66,438 to 80,241. This means that there is a 95% confidence that this interval has the population mean.
Discuss the implication of your statistical findings in terms of the belief that some owners of the automobiles experienced automobile failures.
The first quartile is 59,881 and this means that 25% of the repairs were done with less than 60,000 miles on the vehicle and this means early transmission failures for this manufacturer.
How many repair records should be sampled if the research firm wants the population mean number of miles driven until transmission failure to be estimated with the margin of error of 5000 miles? Use 95% confidence.
(1.96)2(24,899)2 = 96 (5000)2
For the population mean number of miles driven to transmission failure to be 5000 miles, a sample size of 96 transmission repair records will be needed.
What other information would you like to gather to evaluate the transmission failure problem more fully? I would like to know if there are any industry standards that shows the minimum amount of miles that an automobile can go before encountering transmission failure; The amount of transmission problems,
A faulty transmission can deem your vehicle unusable. The fact that the transmission is also one of the most expensive pieces of your car makes it all the more important for you to make it last as long as possible. Here are some ways you can take care of your transmission.
Many drivers decide that they want a car with an automatic transmission because they do not know how to drive a car with a manual transmission, or do not want to bother with having to change gears at the right time. Unfortunately, the luxury of having an automatic transmission is that it is one more vital part of your car that can break down. Even if you are not a mechanic, it is still possible to understand some signs that your car is having transmission trouble. Knowing what to look for will give you a warning that you should take your car into the shop to have it looked at as soon as possible.
Due to the daily wear and tear your vehicle receives on a daily basis that may have caused problems to the transmission, the transmission repair service you get from a reputable transmission shop will help it run more efficiently.
Consider the value of your car or truck. If the cost of the rebuild is more than what your vehicle is worth, then consider just getting a new one. But, if you love your car then you need to do what’s right and get it fixed. If you leave the problem alone and continue to drive your car or truck, it’s highly likely that you’re going to lose your vehicle altogether. Remember, all transmissions vary from vehicle to vehicle, so it’s important to do your research and know exactly what you’re getting
While there are kits sold for transmission rebuilding that are cheap, the true cost comes in the labor required. The mechanic doing the work should have extensive knowledge about the process, as well as experience doing the rebuild. It is in large part because of this that transmission rebuilds are such a
The StreetFigther transmissions are most ideal for pump-gas vehicles. They feature TCI’s Triple Tested quality that guarantees durability and full compatibility with tough street machines. The Super StreetFigther transmissions, on the other hand, are designed for vehicles with 750 to 1,025 horsepower. Drag racers will benefit from the improved performance of the transmissions, and circle track enthusiasts will be at an advantage with the lightweight transmissions. Meanwhile, daily drivers can use TCI’s Street Rodder transmissions.
These can be signs of low fluids in the transmission, which can effect how well your transmission actually performs.
The transmission in your vehicle is what allows you to shift from one gear to the next as you drive. It is one of the most important components of your vehicle. Without your transmission, you would be stuck in neutral, unable to engage your engine and get anywhere. As a new driver, there are a few things you can do to extend the life of your transmission by reducing the wear and tear that you put it through on a daily basis.
The confidence interval in this research is 95% with a 10% error margin (α=0.05, β=0.05). Using these values,
If left alone until it breaks down, transmission repair can be exorbitantly expensive. Depending on the circumstances, it could easily leave the owner with a tough choice between paying for the fix and buying a new car. With some regular maintenance, however, you may never have to find yourself in that precarious position. Any mechanic will be glad to tell you that regular service and maintenance is the key to keeping a car on the road for a very long time. This service could be nothing more than a basic check. It could be as much as a flush. In any event, here are some of the benefits of seeing a mechanic for regular maintenance.
In a vehicle's lifetime, the transmission is usually the least problematic component. You may also know that the transmission is one of the most important parts of your car. Because of this, it's expensive when it needs to be fixed.
Margin of error is a common summary of sampling error that quantifies uncertainty about survey results. Three pieces of data are needed to express the “confidence interval,” : statistic, confidence level, and margin of error. Confidence Interval is usually stated in the following format: 95 percent confidence intervals, or accurate 19/20 times with a margin of error of +/- 5%. This means that 19 out of 20 times it is expected that the mean of the survey result (stats) will fall within 5% above or below the true value. There are strict parameters that determines on which survey results a Margin of Error disclaimer can included.
In table 1.1 with the sample size of 50, the mean is calculated to be 6.72, the standard deviation (SD) from the mean is 2.20 and the average deviation from the sample mean within this population also known as the standard error (SE) is 0.31 (Loiselle, Profetto-Mcrath, Polit & Beck, 2011). Within the sample, the average deviation from the mean is the standard deviation (Loiselle et al., 2011). Therefore, 95% of scores within this sample will be between -2SD which is a value of 2.32 and +2SD which is a value of
Table 3: Paired T-test and 95% CI to determine if the data of % damaged cells and length of service of workers in two operations is paired.
Recommended maintenance schedules are listed in every vehicles owner 's manual, and always include the transmission. The interval varies between vehicles, and heavy use indicates an increase in the frequency of fluid changes. Just as oil is critical to an engine’s performance and longevity, transmission fluid is essential in lubricating the component, and keeping it cool. The fluid deteriorates over time, especially with a lot of stop and go city driving, racing, and hauling heavy loads, which can result in high temperatures and fluid deterioration.