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1) Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
2) Describe each of the following types of designs, explain its logic, and why the design does or does not address the selection threats of Trochim and Donnelly (2006):
a. Non-equivalent control group pretest only b. Non-equivalent control group pretest/posttest c. Cross-sectional d. Regression-Discontinuity
Calculate the test statistic. Determine the p-value of the test-statistic.
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
Determine expectation of number of vehicles passing through this specified point in ten minutes.
Find out the expected shape of distribution of sample mean?
Compute the correlation and sample covariance. Compute the sample covariance and the sample correlation. Intuitively, what kind of correlation.
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
Students need a score of 60 points to pass the exam. What is the probability that a randomly selected student will pas the exam? (P(X ≥ 60))
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
At the .01 significance level, is there a relationship between job pressure and age?
What is the probability that a randomly selected automobile manufactured by the company will have a defective microprocessor?
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
For a standard normal distribution, findout the percentage of data that are among 3 standard deviation below the mean also1 standard deviation above the mean.
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