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You read a report saying that people who buy antiques online tend to be more highly educated than people who buy antiques at live auctions. What are the two variables in this study?
Compute the mean and standard deviation of the hourly wages.
the mean income per person in the united states is 37500 and the distribution of incomes follows a normal distribution.
First, describe in your own words (no direct quotes, please) what a dummy variable is and its purpose in regression analysis. Secondly, provide an example of where you might use a dummy variable from your own professional experience.
What is the difference between statistical significance and practical significance? Can a hypothesis test result be statistically significant and yet practically useless.
Construct descriptive statistics for blood glucose level before the drug was administered and comment.- What is the correlation between blood glucose levels before and after administration of the drug?
a pharmaceutical company knows that approximately 5 of its birth-control pills have an ingredient that is below the
Multiple regression analysis produced following regression equation: Y' = 427.2 - 4.58X1 - 14.83X2 + 6.10X3. Which statement is right based on this analysis?
Verify that according to the sign test, ˆp = 0.29 and that the 0.95 confidence interval for p is (0.04, 0.71), and that the Wilcoxon signed rank test has an approximate p-value of 0.08.
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
epidemiologists control for variables such as confounding and random error by carefully developing research studies.
For each column, identify whether the data is qualitative or quantitative. Identify the level of measurement for the data in each column.
Choose an American driver at random and let the random variable X be the number of speeding tickets the driver has received in the last two years. The discrete probability distribution of X is shown.
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