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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?
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
Suppose you want to conduct a survey of the attitude of psychology graduate students studying clinical psychology toward psychoanalytic methods of psychotherapy.
The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24.
Find the probability that he will answer all 10 questions correctly.
What are the assumptions and requirements for an LP model to be formulated and used? Under what conditions will an LP problem: be unbounded? be infeasible? have more than one optimal solution?
Examine the two standard deviations. What do these indicate about the range of benefits enjoyed by the two groups?
There are four conditions/requirements that must be met in order to perform simple linear regression. For each of the conditions below, choose the technique that should be used to determine whether or not that the condition is met.(Each answer ma..
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