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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 signifi- cantly 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.
Identify at least three methods of statistical inference. Describe in detail each method and how you could use this method in your discipline. You may not use the same tests indicated in your research proposal.
Project was estimated by using ADM/PERT analysis. Due to extensive length of project many activities were combined; Following is the result.
What is the population under consideration
What is the largest value you can use for a random start? Using the following list of the first 15 items in your population, a random start of $25,000, and a rounded sample interval of $100,000.
H0 : Opinion on collective bargaining is independent of employee classi?cation versus Ha : Opinion on collective bargaining is dependent on employee classi?cation using α = 0.05.
a study of pollutants showed that certain industrial emissions should not exceed 2.5 parts per million. you believe a
a company provides component parts for an engine. parts specifications suggest that 95 of items meet specifications.
For a large group of overseas passengers, the mean is 78 pounds and the standard deviation is 15 pounds. compute the relative dispersion of each group.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
Determine the number of monic irreducible polynomials of degree 4 in F_q without using the Moebius Inversion Formula.
Suppose you were a seller of annuities in 1662 when Graunt's book was published. Explain how you would make use of his data on the ages at which people were dying.
a manufacturer of cordless electric shavers sampled 13 from a days production and found the mean time of continuous
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