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In a recent study of incomes in Allegheny county in Pennsylvania it was found that distribution of family incomes is skew to the right. what can we say about the relationship between mean and median?
Within distribution of scores, measures of dispersion give an indication of?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
First-order regression model was fit to data. Part of printout follows?
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
Testing for two Proportions - Is the difference between the averages statistically significant?
Evaluate the mean wait time and throughput rate
Are the events "Republican" and "30-44" independent? Justify your answer. Are the events "Democrat" and "65+" independent? Justify your answer.
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
What is the probability that of the last 100 new juvenile delinquents put on probation, 30 or more will commit another crime?
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