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Suppose that the four inspectors at a film factory are supposed to stamp the expiration date on each package of film at the end of the assembly line. John, who stamps 20% of the package, fails to stamp the expiration date once in every 200 package. Tom, who stamps 60% of the packages fails to stamp the expiration date once in every 100 packages; Jeff who stamps 15% of the packages, sails to stamps the expiration date once every 90 packages; and Paul, who stamps 5% of the packages, fails to stamp the expiration date once in every 200 packages. If a customer complains that her package of film does not show the expiration date, what is the probability that John inspected it?
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
You are trying to set up a portfolio that consists of a corporate bond fund and a common stock fund. the following information about the annual return (per $1,000)of each of these investments under different economic condition is available
Identity Probability Distributions. In this exercise, determine whether a probability distribution is given. In the case where a probability distribution is not described
The number of sit-ups that a person can do in one minute, both before and after a physical fitness course was recorded. The data is shown below for 10 randomly selected participants.
The data below were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Predict the number of injuries (provided there is a significant relationship) if 100 million fireworks a..
Given this information we could use a Z test for two independent means and conclude that indeed the sales are different when the soup is a featured item.
Given the following information about a hypothesis test of the difference between 2 means based on independent random samples, what is the correct rejection region at a significance level of .05?
A random sample of size 25 is taken from a normal population having a mean of 80 and a standard deviation of 5. A second random sample of size 36 is taken from a different normal population having a mean of 75 and a standard deviation of 3.
To determine whether or not they have a certain desease, 80 people are to have their blood tested. However, rather than testing each individual separately, it has been decided first to group the people in groups of 10.
The weight of wrestlers is normally distributed with a mean of 300 pounds and a standard deviation of 40 pounds. What is the probability that a particular wrestler will weigh less than 250 pounds?
To help schedule staffing and equipment needs, a large hospital uses a multiple regression model to predict its 'bed census' y, the number of beds occupied at the end of each day.
Find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes.
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