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A student gets quiz grades of 55,70,82, and 94. He gets a score of 85 on his final exam. Find the weighted mean if the quizzes each count 15% and the final exam counts for 40% of the final grade.
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
eleven patients were weighed before and after a diet which was designed to help patients reduce weight. eight of these
Someone tells you that 50% of the tickets in the box show positive numbers. Do you believe it? Answer yes or no, and explain.
a companyis developing a new high-performance wax for cross country ski racing. in order to justify the price marketing
recent years have also seen an increase in the use of atm machines. when mr. selig took over the bank the mean number
An unpooled variance t-statistic, if appropriate, would have 7 degrees of freedom. Calculate the value of an appropriate test statistic. Construct the rejection region.
21st Century Insurance Company claims that telephone calls for policy holder information are answered in at most 3 minutes. A random survey of 36 phone calls results in the mean 3.3311 and standard deviation 2.1788.
The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. What percentage of samples of 4 fish will have sample means between 3..
A researcher is interested in determining the partial correlation between age (X) and attitude towards interracial marriage (X), controlling for place of residence (rural or urban) (W).
In a certain distribution of numbers the mean is 60 with a standard deviation of 8. Use Chebyshevs theorum to tell the probability that a number lies in each interval.
the distribution of brood size x number of young in a nest of a certain species of bird is given as followsbrood sizexp
Statistical questions tend to fall into what two main categories?
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