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A company employers 800 men under the age 55. Suppose that 30% carry a marker of the male chromosome that indicates an increased risk for high blood pressure.
a. If 10 men in the company are tested for the marker in this chromosome. What is the probability that exactly I man has the marker?
How large a sample must be selected if the company wants to be 85% confident that the true mean differs from the sample mean by no more than 1 day?
What percentage of the variation in their scores on the second round can be explained by their scores on the first round?
1. an experiment has four equally likely outcomes e1 e2 e3 and e4.a. what is the probability that e2 occurs?b. what is
A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they wal..
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time (0 decimals)?
You are reviewing a scientific study where the epidemiologists sampled 1000 people from Charleston, South Carolina and measured variation at two loci, A and B.
A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years.
What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments? What is the probability that a randomly chosen stock investor also invests in fixed income instruments?
the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected. Use a = .05 to test for differences among comfort levels for three types of b..
Convert each of the following z intervals to x intervals.
Given that 30% of US adults are smokers, find the average of the random variable X= # of smokers in a random sample of 50 residents of the USA, also find the variance and standard deviation of X.
calculate the mean or expected value for the number of retransmissions and calculate the standard deviation for the number of retransmissions.
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