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A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week. Clearing these calls for help in a timely fashion is important to the company's image. After telling the caller that resolution of the problem is important the caller is asked whether the issue is "software" or "hardware" related.
Monitored "software calls: 35
Mean time to resolve (mins.) 18
Standard deviation(minutes) 4.2
Monitored "hardware" calls: 45
Mean time to resolve (mins) 15.5
Standard deviation (minutes) 3.9
At the .05 level of significance level is it reasonable to conclude that it takes longer to resolve software issues and and what is the p-value?
Which of these variables are discrete and which are continuous random variables?
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.
History suggests that the average number of hurricanes formed during a year is 6.0 hurricanes. Find the probability of at most three hurricanes being formed during a randomly selected year.
An electric power trading company has an option to buy 1,000,000 terawatts of electricity from a producer for $10 per terawatt. Other electric power trading companies have received this option and the company knows a decision must be made quickly.
Select the appropriate word to identify whether the measurement represents a categorical variable or a quantitative variable: The average number of minutes a person watches television each day.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Assume Nick doesn't know how his received he suppose that all three states of nature are equally likely to occur. If Nick uses the equally likely criterion illustrate what decision would he make.
What is the standard error of the difference between the means?
At α = .01, did yellow fire trucks have a considerably lower accident rate? Determine sample proportions and z test statistic.
A test consists of multiple-choice questions, each having four possible answers (a,b,c,d) one of which is correct. Assuming that you guess the answers to six such questions.
Hypothesis Testing: We wish to test the claim that the mean body mass index (BMI) of men is equal to the mean BMI of women. Use the data to the right to test this claim.
Suppose X is a random variable with mean u and variance sigma2, Calculate the mean vector and variance matrix of the random vector Y = (X,2+3X)?
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