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The manager of a department store wants to determine what proportion of people who enter the store use the store's credit cards for their purchases. What size sample should he take so that at 95% confidence the error will not be more than 6%?
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
Choose one of these tests and describe in your own words, the purpose of the test, any particular assumptions or limitations pertaining to the test, and provide an example where you could employ the test.
Toledo, OH has been experiencing improved economic growth following huge capital investments from companies like Chrysler. You have just been hired by RGP, an agency for facilitating business expansion and location in the Toledo metropolitan area.
A human society claims that less than 31% of U.S. households own a dog. In a random sample of 392 U.S. households, 155 say they own a dog. At a=0.03, is there enough evidence to support the society's claim?
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
Is there sufficient evidence to support the claim that site has an effect on the amount of pesticide?
Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
A group of investors wants to develop a chain of fast food cafés. In determining potential costs for each facility, they must consider, among other costs, the average monthly cost of electricity.
What is the probability that the team wins tonight and that there will be a large crowd at tomorrow's game?
Draw the distribution of the random variable X, representing her time of arrival. (Be sure to include labels and values on the axes.)
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