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Automatic machines that fill packages of all-purpose flour to a desired standard weight need to be monitored closely. A random sample of four packages is selected and weighed. The average weight is then computed. Observations from 15 such samples are shown in Table. The desired weight of packages is 80 oz.
Historical information on the machine reveals that the standard deviation of the weights of individual packages is 0.2 oz.
Assume an acceptable type I error rate of 0.05. Also assume that it is desired to detect shifts in the process mean of 0.15 oz. Construct a cumulative sum chart and determine whether the machine needs to be adjusted to meet the target weight.
Under what circumstances must a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests?
Assume the population standard deviations are the same. At the .10 significance level, can we conclude that the annual rates of return are higher on the big board?
How Many M&Ms of each color were eaten?
The Motion Picture Association of America studies the ethnicity of moviegoers to understand changes in the demographics of moviegoers over time. Here are the numbers of moviegoers (in millions) classified as to whether they were Hispanic, African-..
for a sample of 20 tires of a particular brand the average tread life was 65000 miles with a standard deviation of
at a psychology final exam the scores are normally distributed with a mean 73 points and a standard deviation of 10.6
calculate the samplenbspcovariancenbspbetween two variables x and y using the formulas described in lecture or
Two cards are drawn successively and without replacement from an ordinary deck of playing cards. Compute the probability of drawing-- A heart on the first draw, a club on the second draw.
calculate the expected value of an adjunct professor who prefers to lecture. what is the expected value of an adjunct professor who prefers computer instructions.
if ho b1 0 is not rejected what is the best estimate for the value of the response variable for any value of the
If an executive submits an expense of $720 for a one-day stay in Moscow, should this expense be considered unusually high? Why or why not?
Let f be a Borel measurable function from a separable metric space X onto a metric space S with metric e. Show that (S, e) is separable.
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