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A particular manufacturing process requires steel rods that are at least 3 meters in length. The rods are purchased in lots of 50,000. To determine whether the lot meets the required quality standards, 100 rods are randomly sampled from each incoming lot and the mean length of rods in the sample is calculated. The quality manager has decided to accept lots whose sample mean is 3.005 meters or more. Assume that the standard deviation of the rod lengths in a lot is 0.03 meter.
a. If in fact each lot has a mean length of 3 meters, what percentage of the lots received by the manufacturer will be returned to the vendor (i.e., the supplier)?
b. If in fact all of the rods in all of the lots received by the manufacturer are between 2.999 and 3.004 meters in length, what percentage of the lots will be returned to the vendor?
What is the standard general score conversion formula? Is this the same as a z-score formula? Which leads me to ask How do you convert from one standard score to another?
There is much discussion in the press about several states moving to legalizing marijuana, either for only medical purposes, or more extremely, for recreational purposes. Looking only at the economic impact (not moral implications) of such changes..
According to the U.S. Department of Agriculture, the distribution of U.S. farms according to value of annual sales is as follows. Source: Bureau of the Census, Statistical Abstract of the United States 2006, p. 546.
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1. of 1906 people who came into a blood bank to give blood 300 people had high blood pressure. estimate the probability
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In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories. What will be the critical value of chi-square if the test is to be carried out at the 0.025 level? At the..
Use the normal approximation to the binomial with a correction for continuity.
The Skytek Avionics company uses a new production method to manufacture aircraft altimeters. A simple random sample of new altimeters
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