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An observation from a normally distributed population is considered "unusual" if it is more than 2 standard deviations away from the mean. There are several contaminants that can harm a city's water supply. Nitrate concentrations above 10 ppm (parts per million) are considered a health risk for infants less than six month of age. The City of Rexburg reports that the nitrate concentration in the city's drinking water supply is between 1.59 and 2.52 ppm (parts per million,) and values outside of this range are unusual. We will assume μ-2σ=1.59 ppm and μ+2σ=2.52 ppm. It is reasonable to assume the measured nitrate concentration is normally distributed. (Show work)
John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
Suppose that the number of cars, X, that pass through a car wash between 4:00pm and 5:00pm on any sunny Friday has the following probability distribution:
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
Compute the mean, standard deviation, median, and standard error for each group.
A catalog sales company promises to deliver orders placed on the Internet within 3 days. Follow up calls to a few randomly selected customers show that a 95% confidence interval for the proportion of all orders that arrive on time is 88% ; 6%. Wha..
hypothesis test for the difference between two means.grand strand family medical center is specifically set up to treat
Write a computer program to simulate the queue in Exercise 20. Have your program keep track of the proportion of the time that the queue length is j for j = 0, 1, . . . , n and the average queue length. Show that the behavior of the queue length i..
What is the probability that a single student, randomly chosen from those taking the ACT, scores 21 or higher? What is the probability that the mean score x of a SRS of 50 students is 21 or higher?
Draw the frequency polygon for these data using an initial class boundary of 21.5, an ending class boundary of 46.5 and 5 classes.
What score was earned by more students than any other score? Why? What was the highest score earned on the exam?
In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
1 If sampling is done without replacement, the number of possible samples of size n = 5 from the above population is __________
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