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"By the Numbers: Border Communities" reported on county taxes for a sample of counties in the same state as Allegheny County, a populous county in which we may assume the taxes to be relatively high. Taking into account what percentage of a property's market value was taxed in the various counties, the mills for the four counties mentioned were 4.51, 5.35, 2.86, and 0.41. These were compared with Allegheny County's tax rate of 4.69 mills.
a. Use software to test if the mean for all this state's counties is significantly lower than 4.69, based on the sample of four counties; report the P-value.
b. State your conclusion.
Construct a 99% confidence interval for the difference in the proportions of college freshmen and sophomores who purchased used textbooks.
Construct and show a scatterplot of the data. Does it show a positive correlation, negative correlation or no correlation?
What is the probability that on your next trip to your friend's house, you will have to stop for exactly one red light and what is the probability that you will have to stop for at least one red light
More on insurance An insurance company claims that in the entire population of homeowners, the mean annual loss from fire is µ = $250.
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible (those outside the interval) at the chosen level of confidence.
In a multiple regression with four explanatory variables and 100 observations, it is found that SSR = 4.75 and SST = 7.62.
NCAA Basketball Tournament. Each year, 64 college basketball teams compete in the NCAA tournament. Sandbox.com recently offered a prize of $10 million to anyone who could correctly pick the winner in each of the tournament games.
a study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least
A company is selecting 6 people to be on a committee. There are 24 employees eligible to be on the committee. What is the total number of ways the committee may be formed if the employees are selected at random and each employee will have a differ..
Find the probability that the carbon monoxide concentration exceeds 9 ppm during a randomly selected one-hour period.
What additional information is obtained from measurements on an ordinal scale compared to measurements on a nominal scale?
If the contents in the population of all cans follow a normal distribution, what is the probability that the mean contents of a six-pack are less than 12 oz?
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