# The u.s. department of transportation provides the number of miles

12. The U.S. Department of Transportation provides the number of miles that residents of the 75 largest metropolitan areas travel per day in a car. Suppose that for a simple random sample of 50 Buffalo residents the mean is 22.5 miles a day and the standard deviation is 8.4 miles a day, and for an independent simple random sample of 40 Boston residents the mean is 18.6 miles a day and the standard deviation is 7.4 miles a day.

a)      What is the point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residents travel per day?

b)      What is the 95% confidence interval for the difference between the two population means?

c)       Do these cities have the same population means? State the hypothesis and conclude using alpha = .05

22. A sample of 10 international telephone calls provided Sprint and WorldCom calling rates per minute for calls from the United States.

 Country Sprint WorldCom Australia .46 .26 Belgium .69 .40 Brazil .92 .53 Colombia .55 .53 Denmark .50 .26 France .46 .26 Germany .46 .26 Hong Kong .92 .40 Japan .69 .40 United Kingdom .46 .26

Provide a 95% confidence interval estimate of the difference between the two population means.

34.New York City, Boston, and Silicon Valley of California are among the areas with the highest technology salaries in the United States. The following sample data show individual annual salaries reported in thousands of dollars.

 New York City Boston Silicon Valley 82 85 82 79 80 91 72 74 94 89 78 88 79 75 85 85 80 86 74

Use α = .05 and test for a significance difference among the population mean annual technology salaries for these locations. What is the p-value? What is your conclusion? If a difference exists, which location appears to have the highest mean technology salary?

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.