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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.
Application of simple linear regression analysis to the estimation of a demand equation has yielded the following
in a clinical trial of a drug used to help subjects stop smoking 812 subjects were treated with 1 mg doses of the drug.
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
Steve then conducts a one-sample t-test on the data, knowing that there is an established mean for the publication of others that have taken this test of 6.
suppose the lifetime of a particular appliance follows an exponential distribution with a mean of 10 years. what is the
A random sample of 32 bottles is selected, and the mean amount of water per 1 gallon can is found to be 0.995 gallon. Calculate the test statistic.
in order to determine how many hours per week freshmen college students watch television a random sample of 256
Explain how the power of hypothesis test is influenced by each of the following. Assume that all other factors are held constant. Increasing the alpha level from .01 to .05.
question a multiple-choice test has 6 questions. there are 4 choices for each question. a student who has not
on average 9 babies are born per 24-hour day at a hospital in indianapolis.a what is the probability that at least one
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
A random sample of 10 miniature Tootsie Rolls were taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were as follows:
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