The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data.
Hwy MPG, Automatic | Hwy MPG, Manual | |
---|---|---|
Mean | 22.92 | 27.88 |
SD | 5.29 | 5.01 |
n | 26 | 26 |
lower bound: mpg (please round to two decimal
places)
upper bound: mpg (please round to two decimal
places)
Interpret your confidence interval in the context of the
problem:
Does your confidence interval provide significant evidence for a
difference in the highway fuel efficiency of automatic versus
manual cars? Explain.
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data. Hwy MPG, Automatic Hwy MPG, Manual Mean 22.92 27.88 SD 5.29 5.01 n 26 26 lower bound: mpg (please round to two decimal places) upper bound: mpg (please round to two decimal places) Interpret...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data. Mean SD Hwy MPG, Automatic 22.92 5.29 26 Hwy MPG, Manual 27.88 5.01 26 n 35 25 15 automatic manual Hwy MPG upper bound: lower bound: mpg (please round to two decimal...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data. Mean SD Hwy MPG, Automatic 22.92 5.29 26 Hwy MPG, Manual 27.88 5.01 26 n 35- 25 15 automatic manual Hwy MPG lower bound: mpg (please round to two decimal places) upper...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data. Hwy MPG, Automatic Hwy MPG, Manual Mean 22.92 27.88 SD 5.29 5.01 26 n 26 35 25 IH 15 automatic manual Hwy MPG lower bound: mpg (please round to two decimal places)...
The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from Exercise 5.32). Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of manual and automatic cars, and interpret this interval in the context of the data. Hwy MPG, Automatic Hwy MPG, Manual Mean 22.92 27.88 SD 5.29 5.01 n 26 26 lower bound: ______ (please round to two decimal places) upper bound: ______ (please round to two decimal...
Fach year the US Environmental Protection Agency (EPA) releases fuel economy data on cars manufactured in that year. Below are summary statistics on fuel efficiency (in miles/gallon) from a random sample of cars with manual transmissions and a random sample of cars with automatic transmissions manufactured in 2012. Assume that conditions for inference are satisfied City MPG Automatic Manual 16.12 19.85 3.58 4.51 Mean SD automatic manual City MPG (a) Compute the standard error (SE) of the difference of the...
In analyzing the city and highway fuel efficiencies of many cars and trucks, the mean difference in fuel efficiencies for the 642 vehicles was 7.35 mpg with a standard deviation of 2.48 mpg. Find a 95% confidence interval for this difference and interpret it in context. The 95% confidence interval for the difference in fuel efficiencies is left parenthesis nothing comma nothing right parenthesis mpg.
We considered the differences between the reading and writing scores of a random sample of 200 students who took the High School and Beyond Survey in Exercise 5.21. The mean and standard deviation of the differences are x̄read-write = -0.545 and 8.887 points respectively. (a) Calculate a 95% confidence interval for the average difference between the reading and writing scores of all students. lower bound: points (please round to two decimal places) upper bound: points (please round to two decimal...
The fuel economy sticker on a new SUV’s window sticker indicates the owner can expect 16 mpg in city driving and 20 mpg highway driving and 18 mpg overall. Accurate gasoline records for one such vehicle were kept, and a random sample of mileage per tank of gasoline was collected: 17.6 17.7 18.1 22.0 17.0 19.4 18.9 17.4 21.0 19.2 18.3 19.1 20.7 16.7 19.4 18.2 18.4 17.1 17.4 15.8 17.9 18.0 16.3 17.5 17.3 20.4 19.1 21.0 18.1 19.0...
(8 points) Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The histogram below shows the distribution of gas mileage in miles per gallon (MPG) from 14 users who drive a 2012 Toyota Prius. The sample mean is 53.3 MPG and the standard deviation is 5.2 MPG. Note that these data are user estimates and since the source data cannot be verified, the accuracy of these estimates are not...