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Suppose that a tax increase is being proposed for a large city in order to support the public school system. Further suppose that 55% of the city's population is in favor of the tax, and 45% of the population is against the tax. If a random sample of 400 people from this city are interviewed, what is the probability that 200 or fewer people in the sample will support the tax increase?
The probability of going to college is 0.4. What is the probability that the proportion of women who go to college is greater than 50%.
Temperature is used to measure the output of a production process. When the process is in control , the mean of the process is 128.5 and the standard deviation is 0.4
I am conducting research on microscopic toolmark analysis. If I have a toolmark with 27 striations (lines) of varying spatial relationships (orientations),
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
If you test the null hypothesis at the 0.01 level of significance, is there evidence that the new process has reduced turnaround time? Interpret the meaning of the p-value in this problem.
sociologists say that 80 of married women claim that their husbands mother is the biggest bone of contention in their
Polls showed the two main candidates in 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%.
A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small cafe during their visit. Laura claims that 10% of tourists will include a visit to a cafe.
the average drive to work for a sample of 6 teachers at a large high school is 17 miles. the standard deviation of this
conduct a z-test to determine whether the following two samples indicate that the population proportions are
The speeds of all vehicles have a bell-shaped distribution with a mean of 72 mph and a standard deviation of 3 mph. Using the empirical rule, find the percentage of vehicles with the following speeds on this section of I-95.
ABC Trucking Company purchased 15 trucks at the same time to start their business. 5 Trucks were purchased from Peterbilt, 5 from Freightliner, and 5 from Kenworth.
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