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The mean value of land and buildings per acre from a sample of farms is ?$1700?, with a standard deviation of ?$100. The data set has a? bell-shaped distribution. Assume the number of farms in the sample is 71.
?(a) Use the empirical rule to estimate the number of farms whose land and building values per acre are between ?$1500 and ?$1900.
Find an example of an observational study in the news. Determine whether or not it was a case-control study and whether it was prospective or retrospective.
If a straight-line probabilistic relationship relates the mean E(y) to an independent variable x, does it imply that every value of the variable y will always fall exactly on the line of means? Why or why not?
Let x represent the height of first graders in a class. This would be considered what type of variable:
In the drug testing decision, find and interpret EVSI and EVPI. Here, "sample" information refers to the information from the imperfect drug test.
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
Give the null and alternative hypotheses for testing whether the average level this year is less than 15 ppm.- Describe a Type I error for this test.
Assume the variance is known to be 0.49. Is there evidence at the 0.05 level that the valve performs above the speci?cations?
The disk file cancer contains values for breast cancer mortality from 1950 to 1960 (y) and the adult white female population in 1960 (x) for 301 counties.
Tug of war is a game played by most people in their youth. In the wild, animals tussle with each other in similar ways but with much more
Find the parameters of the distributions obtained in a) and b) in terms of the parameters of the joint distribution of V and W.
The manufacturer has to replace or exchange 10% of its model I and 18% of its model II. If a model is selected at random, find the probability that it will be defective?
A company provides its three employees with health insurance under a group plan. For each employee, the probability of incurring medical expenses during a year is 0.9, so the number of employees incurring medical expenses during a year has a binom..
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