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A manufacturer makes two models of an item : Model I, which accounts for 80% of unit sales, and model II, which accounts for 20% of unit sales. Because of defects, the manufacturer has to replace or exchange 10% of its model I and 18% of its model II. If a model is selected at random, find the probability that it will be defective?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Gallons and standard deviation 12 gallons. On a randomly selected day, the probability that the store sells at least 154 gallons is?
In general, when the dependent variable is neither interval nor ratio in level of measurement -- i.e., is not numeric -- a nonparametric statistical test is required to test the null hypothesis.
Kurt's Adventures, Inc. stock is quite cyclical. In a boom economy, the stock is expected to return 30% in comparison to 12% in a normal economy and a negative 20% in a recessionary period.
According to a recent survey, the probability that a passengerfiles a complaint with the Department of Transportation about aparticular U.S. airline is .000014. Suppose 100,000 passengers whoflew with this particular airline are randomly contacted..
Calculate and interpret the appropriate statistical test to determine the relationship between the following two variables. Use the five-step model of hypothesis testing to draw conclusions at the .05 level of significance
the flavor of gum that is purchased. Determine the test value for the data given type number sold spearmint 25 wintergreen 32 cherry 18 cinnamon 43.
The following data resulted from a taste test of two different chocolate bars. The first number is a rating of the taste, which could range from 0 to 5, with a 5 indicating the person liked the taste.
For a study that consists of personal interviews with participants (rather than mail or phone surveys), explain why simple random sampling might be less practical than some other sampling methods.
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
Assume a very large normally distributed population of scores on a test with mean 77 and standard deviation 7.
suppose that in the setting of the previous exercise you are willing to settle for a margin of error of $1000. will the required sample size be larger or smaller?
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