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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.
in a random sample of five microwave ovens the mean repair was 80.00 and the standard deviation was 11.50. assume the
identify the types of samples- systematic cluster convenience random stratified1. a sample was taken of every 49th
a sample of 400 female consumers of a product had a mean age of 33 with a standard deviation of 5 and a sample of 500
Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One componet has a 1/100 chance for failur. What is the overall reliability of the product?
Find out the mean for your 3 numbers. They signify your neighborhood's news-viewing habits. Mean is number of news programs viewed in neighborhood each week.
auto glass companies now have a machine that can repair broken windshields with a success rate of 85. if a random
Develop 95% confidence intervals for the proportion of all students, the proportionof male students, and the proportion of female students who were involved in sometype of cheating.
the management of abc industries is considering a new method of assembling its golf cart. the present method requires
in a batch of 8000 clock radios 8 are defective. a sample of 12 clock radios is randomly selected without replacement
In studies for a medication, 13 percent of patients gain weight as a side effect. suppose 514 patients are randomly selected. Use the normal approximations to the binomial to approximate probability that
An automobile manufacturer wants to estimate the mean gasoline mileage that its customers will obtain with its new compact model.
Tthe true population mean when different samples of the same size are taken. Note that the variability of the sample mean is LESS than that of individual observations Does this makes sense?
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