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As the purchasing agent of your company you are deciding what type of Xerox machine to buy for your company. You have narrowed your choices to brand X and brand Y. Which have been recommended to you by two friends. Your selection criteria is durability. Your first friend tells you that the 8 brand x machines in her company have an average life-time of 200 days, with a standard deviation of 9 days. Your other friend tells you that the average life-time of the 6 machines in her company is 210 days with a standard deviation of 6 days. Which machine would you pick?
a random sample of n 35 observations from a quantitative population produced a mean x2.4 and a standard deviation
according to a recent survey about 33 of americans polled said that they would likely purchase reusable cloth bags for
A sample, in hour's of life, is as follows:: 123, 116, 122, 110, 180, 126, 125 Find all Measures of Location (Central Tendency) and Measures of Variability (Dispersion or Variation).
A medical test for malaria is subject to some error. Given a person who has malaria, the probability that the test will fail to reveal the malaria is 0.06. Given a person who does not have malaria, the test will correctly identify that the person ..
1. a random sample of 26 offshore oil workers took part in a simulated escape exercise and their times sec to complete
What is the relationship between sales and the amount spent on advertising? The owner collected data for the past year by month. The data is in millions of dollars.
Suppose that you conducted your own telephone survey at that time and randomly called people and asked them to describe their level of confidence in the Supreme Court. Find the probability distribution for Y , the number of calls until the first p..
Dr. H wants to conduct a statistical test that will show her new medication to be effective in decreasing violence in criminals. What is the null hypothesis? What is the alternate hypothesis?
To obtain data, the obituary columns of the New York Times are read for 30 days, and the ages at death of people in the United States are noted. Do you think this approach will lead to a representative sample?
A University Web server has five main components each with the same reliability. All five components must work for the server to function as intended.
What proportion of the variation in listing price is determined by variation in the square footage? What proportion of the variation in listing price is due to other factors?
In random samples of 25 from each of two normal populations, we found the following statistics: Estimate the difference between the two populations means with 95% confidence.
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