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Question: a. What kind of variable should you create in order to include information about a categorical variable among your X variables? Please give the name of the variables and indicate how they are created.
b. For a categorical variable with four categories, how many indicator variables would you create?
c. What does the regression coefficient of an indicator variable indicate?
Explain why researchers do not use random samples. How are they able to generalize their results?
Construct a regression equation in which total U.S. box office grosses are predicted using the other variables. Produce the appropriate residual plots to determine if the linear function is the appropriate regression function for this data set.
Discuss two sources of air pollution and what can/should be done about it.
Evaluate each expression-Diameter of a circle. If the diameter of a circle is 1.3 * 10^-12 meters, then what is the radius?
Clearly a straight line model does not accurately describe what is going on with this data. Does this mean there is no relationship between income and time?
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Suppose we knew that he was late for the visit. What is the probability that he came by train? Suppose we knew that he was not late for the visit. What is the probability that he came by train?
suppose that 50 identical batteries are being tested. after 8 hours of continuous use assume that a given battery is
Below is a plot of the Olympic gold medal winning performance in the high jump (in inches) for the years 1900 to 1996.
The percentage of protein in a certain brand of dog food is a normally distributed random variable with mean 11.2% and standard deviation 0.6%.
the distribution of the annual incomes of a group of middle management employees approximated a normal distribution
Suppose the number of nonconformances in the engine and transmission are recorded separately for each car.
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