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A study of 420039 cell phone users found that 131 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0225% for those not using cell phones. A: use the sample data to construct a 95% confidence interval estimate of the percentage of the cell phone users who develop cancer of the brain or nervous system
q1. two different methods were used to determine the yield of a chemical. the experiment was run using eight different
the average flight from point a to point b takes 100 minutes with a standard deviation of 10 minutes.a. what is the
A health care professional wishes to estimate the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean?
The 587th of the 731 trees in the preserve was selected as the first observation in the sample. What is the tree number of the second observation in the sample?
suppose the joint pdf of lifetimes of a certain part and a spare is given byfx y e?xy 0 lt x lt ? 0 lt y lt ?and zero
What is the best first glance prediction you can give the customer about the value of his house given your 2 variable linear regression analysis?
Calculate the sample mean, median, range, sample variance and sample standard deviation only for each of the four variables and explain what each value tells us about the motion picture industry.
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality?
Forecasters interest rate predictions over the period 1982 1990 were studied to see whether the predictions corresponded to what actually happened.
A recent study of minimum wage earners found that 51.3% of them are 16 to 24. suppose a sample of 600 minimum wage earners is selected. is it appropriate to use the normal approximation to the binomial distribution.
Let x be a random variable that represents a test score. What is the lowest score that would still place a student in the top 40% of the scores?
a days sales in 1000 units at a gas station have a gamma distribution with parameters k 2 and 09.a what are the
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