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A random variable Xhas an unknown mean and known variance 4. How large a random sample should one take if the probability is to be at least 0.95 that the sample mean will not differ from the true mean E[X} by (i) more than 0.1, (ii) more than 10% of the standard deviation of X. (iii) more than 10 % of the true mean of X, if the true mean of X is known to be greater than 10.
Set up the null and alternative hypotheses, and perform the hypothesis test with a significance level of 0.05.
in a test of the drug lipitor 16.7 of the subjects treated with 10mg of atorvastatin experienced headaches. assume 60
How might the risk perceptions and preferences of the average investor in the stock market differ from those of the average investor in the direct private.
The article "Response of SiCf /Si3N4 Composites Under Static and Cyclic Loading-An Experimental and Statistical Analysis" (J. of Engr. Materials and Technology, 1997: 186-193) suggests that tensile strength (MPa) of composites under specified con..
Only 15% of all these washing machines last at least 5 years.- What is the standard deviation of the lifetime of a washing machine made by this manufacturer?
Test the hypothesis that the average hourly wage for City A is more than $0.50 per hour above the average hourly wage in City B using the following sample data:
twelve randomly selected mature citrus trees of one variety have a mean height of 13.8 feet with a standard deviation
construct a 90% confidence interval for the true mean weight. what sample size would be necessary to estimate the true weight with an error +/- 0.03 grams with 90% confidence?
Public Policy and Political Science Officials in Dexter, a small town in upstate New York, have decided to install more fire hydrants in order to decrease.
Use random sampling of clusters to estimate the mean or total of a population of your choice. In the process of carrying out the survey and making the estimate, think about or discuss with others the following:
Apples. An orchard owner knows that he'll have to use about 6% of the apples he harvests for cider because they will have bruises or blemishes.
A fair coin is tossed 100 times. the probability of getting exactly 50 heads is close to one of the following numbers.
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