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What's the cause? Suppose a researcher studying health issues measures blood pressure and the percentage of body fat for several adult males and finds a strong positive association.
Describe three different possible cause-and-effect relationships that might be present.
Assume grades in a course follow a normal distribution. The average grade in a class is 75, and the standard deviation is 5 points. A professor takes a sample of 10 people in the class and calculates the average for that class is also 75. IN other..
a survey was conducted of 611 office workers to determine telephone answering practices i.e how many were able to
A company owns 400 laptops. Each laptop has an 8% probability of not working. You randomly select 20 laptops for your salespeople. What is the likelihood that they will all be broken?
What is the best point estimate of the population mean and what is a reasonable range of values for the population mean, i.e. upper and lower end of the confidence interval?
1. What is meant by the sensitivity of a dependent measure? What are ceiling and floor effects?- What are demand characteristics? Describe ways to minimize demand characteristics.
a contractor is considering a sale that promises a profit of 20000 with a probability of 0.7 or loss of 7000 with a
a certain brand of flood lamps has a lifetime that has a normal distribution with a mean of 3750 hours and a standard
1.an experiment tests the effects of new devices to help stop smoking. they tested hypnosis nicotine gum nicotine patch
good portfolio managers beat the benchmark in 80 of the years. mediocre portfolio managers beat the benchmark in 40 of
The operator of a metropolitan sewer system wishes to have a sum of $200,000 accumulated 25 years from now for an expected major rehabilitation at that time. The owner plans to invest $2000 per year into this special fund, starting December 2012. ..
Determine the probability that exactly 11 cars approach this toll booth in the minute from noon to 1 min past noon.
In the experiment, the waiter would ?ip a coin to determine whether he would stand or squat next to the table. The waiter would record the amount of the bill and of the tip and whether he stood or squatted. Describe the treatments and the respo..
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