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Manufacturing and Product Development
The radial shrinkage in paper birch wood from green to oven dry is approximately 6.3%. A new process has been developed to decrease the variability in shrinkage. In a random sample of 21 pieces of paper birch, the sample variance in shrinkage was 0.39. Is there any evidence to suggest the population variance in shrinkage is less than 0.50? Assume normality and use a = 0.10.
indy 31.4 is a radio station that plays music 24 hours a day 7 days a week. they have edited every song they play so
find the sampling distribution and pdfs of ysub1 and ysubn for random samples of size n from a continous uniform
Todd is less interested in testing a hypothesis than he is in developing an estimate for what people would be willing to pay. He would like 95% confidence intervals for the average price people would be willing to pay
Identify different types and levels of statistics - Describe the role of statistics in business decision-making.
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
A solid, round simply supported steel shaft has a diameter of 38 mm and a span length of 800 mm. The shaft supports a concentrated load of 3 kN at midspan. Calculate the maximum deflection of the shaft.
Test the claim that the mean weight loss is greater than 0. Based on these results does the diet appear to be effective. Does the diet appear to have practical significance.
a machine is designed to fill jars with 16 oz. of coffee. a consumer suspects that the machine is not filing the jars
Set up the null and alternative hypotheses, and perform the hypothesis test with a significance level of 0.05.
Show that for a bivariate normal distribution the correlation coefficient between x' and y' can be expressed in terms of the infinite expansion (Eq. 8.61).
An economics course are independent events, what is the probability that a randomly selected student is registered in either a math course or an economics course?
A sample is selected from a population with a mean of =40 and a standard deviation of 8. If the sample has n=4 scores, what is the expected value of M and the standard error of M?
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