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1. A maintenance engineer has been approached by a supplier who promises less downtime for machines using its new molybdenum-based super lubricant. Of 120 machines maintained with the new lubricant, only 20% were out of service for more than an hour during the month of the test, while 30% of the 100 machines using the previous lubricant were down for more than an hour. Using the 0.05 level in an appropriate test, evaluate the supplier's contention. Using the appropriate statistical table, what is the approximate p-value for this test?
2. According to the National Center for Education Statistics, 88% of elementary, middle-school, and secondary- school students from families earning $75,000 or more per year use a computer at school, compared to 81% from families earning less than $20,000. Using a one-tail test at the 0.01 level, and assuming that the percentages are from independent samples of 500 families each, is the percentage of more-affluent students using computers at school significantly greater than for those from lower-income families?
Determine and interpret the p-value for the test. Source: Bureau of the Census, Statistical Abstract of the United States 2009, p. 163.
a company has 1300 items. in a sample of 120 items the historical cost of each item was compared with the audited value
Use this tree diagram and the probability determined in part (a) to calculate the probability that she should receive at least one payment exactly on time.
What percentage of the variation in y can be explained by the corresponding variation in x and the least-squares line?
Determine the probability that their SAT scores will differ by more than 50 points?
In the graphical method, how do you know when a problem is infeasible, unbounded, or when it has multiple optimal solutions? Give a real-world example of when you could have an infeasible problem.
before a championship football game the referee is given a special commemorative coin to toss to decide which team will
for the following managerial dilemmas formulate a research problem and plan the findings of which will aid the decision
If you were designing a study which group, a population or a sample, would you gather data from and why? Provide an explanation regarding whether or not the standard deviation is a biased or unbiased estimate.
Suppose that the moment generating function of (X, Y )t is ψX,Y (t, u) = exp{2t + 3u + t2 + atu + 2u2}. Determine a so that X + 2Y and 2X - Y become independent.
Interpret the meaning of the y-intercept and the slope within this scenario. The y-intercept is out of the range of the MPG data and, as a result, has no interpretation. The determination coefficient R square is 0.63. This means the least square re..
Given the following frequency distribution, find out the mean, variance, and standard deviation.
The number of UFO (Unidentified Flying Object) sightings per week in Roswell, NM is a random variable with the cumulative distribution function given below.
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