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Question: Diameters of bolts produced by a particular machine are normally distributed with mean 0.760 cm and standard deviation 0.012 cm. Specifications call for diameters from 0.720 cm to 0.780 cm.
a) What percentage of bolts will meet these specifications?
b) What percentage of bolts will be smaller than 0.730 cm?
Use the given degree of confidence and sample data to construct a confidence interval for the population mean x. Assume that the population has a normal distribution.
Hypothesis Testing
How many adults must be randomly selected to estimate the mean driving time of Chicago commuters? We want 99% confidence that the sample mean is within 4 minutes of the population mean, and the population standard deviation is known to be 8 minute..
What is the 95% confidence interval for the true mean length of the bolt?
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Researchers at Pharm-X, a pharmaceutical company, are testing and comparing the effects of Drug A and Drug B on participants' allergies. The researchers are using a double-blind procedure to conduct their test.
given the linear correlation coefficient r and the sample size n determine the critical values of r and use your
What are the considerations to think about/discuss in accepting or rejecting this order? Would you accept or reject the order? Why?
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