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For each of the following situations, determine whether a one-tail test or a two-tail test would be appropriate. Describe the test, including the null and alternative hypotheses, then explain your reasoning in selecting it.
a. A machine that has not been serviced for several months is producing output in which 5% of the items are defective. The machine has just been ser- viced and quality should now be improved.
b. In a speech during her campaign for reelection, a Republican candidate claims that 55% of regis- tered Democrats in her county intend to vote for her.
c. Of those who have bought a new car in the past, a dealer has found that 70% experience three or more mechanical problems in the first four months of ownership. Unhappy with this percentage, the dealer has heavily revised the procedure by which predelivery mechanical checks are carried out.
This is an example of a Binomial probability experiment; This is neither a Poissonnor a Binomial probability experiment; Not enough information to determine the type of experiment.
mary wants to see if she can predict the number of volunteer hours that potential volunteers will provide if she has
What are the implications of statistical variation? Why are we interested in understanding and measuring variation?
Chlorine concentration in a municipal water supply is a uniformly distributed random variable that ranges between 0.74 ppm and 0.98 ppm.
What is the shape of the theoretical sampling distribution of the mean for samples of (a) 10 if the parent population is normal? (b) 50 if the parent population is not normal?
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
online magazines make it easy for reasers to link to an advertisers website directly from an advertisement placed in
the anxiety general stress test angst has been designed to gauge the level of psychological stress management
find the 95 confidence interval for the variance of the heights of maple trees if a sample of 21 trees has a standard
a penny collection contains twelve 1967 pennies seven 1968 pennies and eleven 1971 pennies. if you are to pick some
the weinberg electronics corporation manufactures four highly technical products that its supplies to aerospace firms
Biologist estimates that 50% of the deer in a region carry a certain type of tick. For a sample of 300 deer selected at random, what is the chance that 155 or fewer deer have this tick?
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