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19. A consumer analyst collected the following data on the screen sizes of popular LCD televisions sold recently at a large retailer:a. Does there appear to be a linear relationship between the screen size and the price?b. Which variable is the "dependent" variable?c. Using statistical software, determine the regression equation, interpret the value of the slope in the regression equation.d. Include the manufacturer in a multiple linear regression analysis, using a "dummy" Hint You will need to us a set of indicator variables.f. Make a plot of the residuals and comment on whether they appear to follow a normal distribution.e. Plot the residuals versus the fitted values. Do they seem to have the same amount of variation?
Compare the unconditional probability of having the disease to the conditional probability of having the disease given the test says you have the disease.
The following table gives the approximate age distribution in the United States from the 2000 census.
Is a weight fain of 15 pounds of (6.8) kilograms unusual? Why or why not? If 15 pounds (or6.8kilograms) is not unusual does that support the legend of the "freshman 15"?
would this prove that they are exceeding their goal, using α = 0.025?
Suppose you just received a shipment of eight televisions. Two of the televisions are defective. If two televisions are randomly selected, compute the probability that both televisions work. What is the probability at least one does not work?
A high of 10 was possible. A sample of five tests was selected from each group. The test grade results were: At the 0.01 level, what is the critical value?
Determine the following areas under standard Normal distribution curve.
The researcher will then compare the scores for the 2 treatments. If there is a difference between the 2 groups of scores, briefly explain how the difference may have been caused by the treatment.
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length.
What is your approach? Also, what about the other components of hypothesis testing such as confidence level?
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
Determine the overall probability (rating), given all the ratings and weightings that, when A, B, C, D and E are combined.
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