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Scientists are interested in whether a list of home cleaning products are carcinogenic. To find out, the scientists would like to sample several thousand homes and investigate whether the product is present in their cleaning supplies.
What type of sampling method do you think would provide the most unbiased sample, a cluster sample or a stratified sample?
During their annual membership drive, they hope to sign up 50 new members each day. Would you expect he distribution of the donations for a day to follow.
What is a statistic that is misleading or confusing? Why is the statistic misleading or confusing?
What is the difference between expected value and mean? In other words, what would be difference between the expected value of something, as opposed to the mean of that something? And how do I know when I should be finding the expected value and n..
The size of apples in an apple orchard are normally distributed with a mean weight of 90 g and a standard deviation of 20 g.
What is the distance d? Assume that buoyancy effects of the water on the chain are negligible. Hint: Establish the origin of the coordinate system at B as shown in order to find the chain length BA.
Determine the mean and variance of X. Plot the probability density function (pdf) and cumulative distribution function (CDF) of X.
What is the explained return on an equally weighted portfolio of these three stocks? What is the variance of a portfolio invested 20 percent each in A and B and 40 percent in C?
Let X and Y be two random variables with moment generating functions MX (t) and MY(t), respectively. If MX(t) for all values of t, then X and Y have the same probability distribution.
A sample of 20 managers was taken, and they were asked whether or not they usually take work home. The responses of these managers are given below.
What is the probability that a roll of tape 1200 Ceet long contains no defects?
A) If Y is normal with μ = 200 and σ = 12, what is the probability that Y will be between 186 and 210? B) If X is normal with μ = 8.48 and σ = 1.60, what is the difference between the two values of X which include the central 70% of the probability..
If we wish to be 95% certain of avoiding a Type I error, use these data to examine differences in the average distance traveled to the two clinics.
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