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A student takes a 20 question, multiple choice exam with five choices for each question. Find the probability of making at least 15 questions correct, if student guesses on each question.
What is the expected number of students who have registered on a pass/fail basis? What is the probability that more than three are registered on a pass/fail basis?
In How It Works 15.2, we calculated the correlation coefficient between students' age and number of hours they study per week.
bob a manufacturing plant manager is inspecting the diameters of ball bearings produced by a suspected malfunctioning
Use your calculator to show that the correlation is about 0.5. What feature of the data is responsible for reducing the correlation to this value
A market research worker interviewed a random sample of 18 people about their use of a certain product.- Estimate the population proportion of users of the product.
In these questions we have to make a decision about the given claim. For example, if the claim is that a coin favors heads and sample results consists of 11 heads in 20 flips, conclude that there is not sufficient enough evidence to support the cl..
Range of women's heights. In Chance (Winter 2007), Yale Law School professor Ian Ayres published the results of a study he conducted with his son and daughter.
A multiple linear regression has been performed using four independent random variables, X1, X2, X3 and X4. The regression output is:
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
a small business just leased a new computer and color laser printer for three years. the service contract for the
A simple random sample of 91 adults is chosen. Find the 62 percentile for the sample mean.
Then compute the expected number for each interval for a sample of 500. Finally, perform the goodness-of-fit test and summarize your results
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