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Consider a test that measures adults' memory skills and suppose that scores are bell shaped. You take the test and obtain a score of 254.21 and are told that you are in 96.1th percentile. Your friend also takes the test and obtains a score of 161.42 an dis told that he in in the 22.8th percentile. What is overall mean and standard deviation of the test scores? Sketch the distribution and show where you are and where your friend is?
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
At the Statsville County Fair, the probability of winning a prize in the ring-toss game is 0.1. Show the probability distribution for the number of prizes won in 8 games.
A researcher estimates an AR(1) model with an intercept and finds that the OLS estimate of Beta1 is 0.95, with a standard error of 0.002.
We suspect that automobile insurance premiums (in dollars) may be steadily decreasing with the driver's driving experience (in years), so we choose a random sample of drivers who have similar automobile insurance coverage and collect data about th..
If the research question were defined as will buyers purchase more of a product in a blue colored or silver package? the most appropriate type of research would be
From an urn containing balls, a ball was drawn, weighted and replaced. This experiment was repeated 5 times. what is the standard error of sample mean?
use the following sample data to test whether the GPA are different at the 0.05 level of significance.
In a classical experiment, Gregor Mendel observed the shape and color of peas that resulted certain crossbreedings. A sample of 556 peas was studied with the result that 315 produced round yellow,
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
To revise an existing inventory system, a company needs to know something about the lead time for orders it places for a critical part. The company looks at the last 20 orders placed and finds that the lead time in days are:
Consider you have completed a survey of employees working in a call center doing customer service for a major manufacturing company.
Compute the population attributable risk for smoking and lung cancer.
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