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Hand in an article or report about a study for which a sample has been taken. Tell what you know, or can reasonably guess, about what kind of sampling plan was used. Be sure to mention whether the sampling plan included randomness and whether it seems susceptible to some kind of bias. Tell whether the sample size seems fairly large and, if not, whether it would be feasible to obtain a larger sample.
1. How does multicollinearity manifest itself in a regression situation? 2. Explain what is meant by perfect collinearity. What happens when perfect collinearity is present?
a professional gambler claims that he has loaded a die so that the outcome of 123456 have corresponding probabilities
For each of the two groups, boys and girls, choose the lowest age group as the baseline and calculate the odds ratio associated with each age group.
Why did we not extend the red line (for the women) all the way to 74 inches, instead stopping at 69 inches?
In Part A of this assignment, you selected a random sample of 30 StatCrunch U students and created a StatCrunch file containing data from the above survey for those students. You will use the StatCrunch data file you created in Part A to complete thi..
Indicate if the hypothesis test is for independent group means, population standard deviations, and/or variances known.
Construct a p-chart by setting up the exact control limits for each sample. Are any samples out of control? If so, assuming special causes, revise the centerline and control limits.
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
Explain the difference between accuracy and precision of measurements. How do you control for accuracy? What can you do about precision?
Run a multiple regression and interpret all the findings, R 2 , F, IV coefficients, and the intercept. Then in paragraph format, identify and report the following:
What is the probability X is exactly 5? - What is the probability that X is no more than 10?- What is the probability that X is at least 20?
Hospital stays. The U.S. National Center for Health Statistics compiles data on the length of stay by patients in short-term hospitals and publishes.
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