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Ten percent of the tools produced in a certain manufacturing process turn out to be defective.
Find the probability that in a sample of 10 tools chosen at random exactly 2 will be defective by using (a) the binomial distribution and (b) the Poisson approximation to the binomial distribution.
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. Compute and interpret the Z score for each of the six entertainment expenses.
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence. Z-test for Unpaired data.
The different types of malfunction occur at about the same frequency. Develop a probability distribution for the duration of a service call.
in a poll of 600 randomly selected subjects 240 answered yes when asked if they planned to vote in a state election.
Which option produces the smallest risk of a Type I error?
a catalog company that receives the majority of its orders by telephone conducted a study to determine how long
Chosen field within a year after graduation. Find the probability that 11 randomly selected graduates all find jobs in their chosen field within a year of graduating.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
Change the frequencies to percentages - is there a group more likely to get high salaries.
six second-graders tried tossing a ball into a basket ten times each. their teacher then suggested a different way of
Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135. Given that he tested 10 people, what would be the estimated population variance?
Four brands of light bulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
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