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1. Explain the similarities and differences between simple linear regression and multiple regression.
2. What is the general form of the multiple regression equation? What does a represent? What do the b's represent?
3. Why would a researcher prefer to conduct a multiple regression study rather than separate regression studies using one independent variable and the dependent variable?
4. What are the assumptions for multiple regression?
5. How do the values of the individual correlation coefficients compare to the value of the multiple correlation coefficient?
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
Carry out an overall test to determine if there is significant evidence of a difference among A; B and C, at the significance level 1%.
What kinds of plots are useful in data screening? What can you do if your data do not meet the assumptions of your statistic?
Calculate the standard deviation of the data. For this calculation compute the difference between each one of the observations and the mean.
Using thesedata, perform a simple regression analysis to predict the price of a digital camera using the number of effective megapixels. Interpret the slope term and state whether it is consistent with the buyer's prior belief.
The mean time between reoccurring events is exponentially distributed with a mean time between events of 15 minutes.
which of the following would cause a change in a feasible region?removing a redundant constraintincreasing an objective
Interpret the slope.
the random variable x has a poisson distribution with mean 40. give an approximate value of the probability p 37 less
a researcher would like to evaluate the effectiveness of a pain-relief patch designed for lower back pain. prior to
The probability will be .90 that the sample mean will not differ from the true mean by more than 20 percent of the std. deviation. How large a sample should he take?
purpose students will conduct one brief research exercise that will be written up as a research report using apa
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