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1. How does multicollinearity manifest itself in a regression situation?
2. Explain what is meant by perfect collinearity. What happens when perfect collinearity is present?
3. Is it true that the regression equation can never be used adequately for pre- diction purposes if multicollinearity exists? Explain.
4. In a regression of Y on the two explanatory variables X1 and X 2, the F ratio was found not to be signi?cant. Neither t ratio was found to be signi?cant, and R2 was found to be 0.12. Do you believe that multicollinearity is a problem here? Explain.
a.nbspthe random variable x is the number of siblings of a student selected at random from professor appiahs
Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of women physicians at the university health system exceeds 27.9%?
Conduct a hypothesis test using the .04 level of significance to determine if there is a difference between the population means.
How many business students must be randomly selected to estimate the mean monthly earnings of business students at one college?
you plan to conduct a survey to find what proportion of the workforce has two or more jobs. you decide on the 99
Find the mean, median, and range for each of the two data sets. b.Find the standard deviation using the rule of thumb for each of the data sets.
Based on this information, calculate the interest charged by each card for this purchase and which card is the better deal and by how much
Probability of selecting a graduating college who had given blood that percent of the time. What is the mean number of times a person gave blood based on this poll?
Use an ANOVA with α=.05 to determine whether there are any significant differences among the three treatment means. (both by hand and in PASW), for the hand version of problem.
Determine, with 95% confidence, if the stocks from "socially conscious" companies are different from the mean P/E ratio of all other major stocks.
Conduct a hypothesis test to test that the population mean for population A is no greater than the population mean for B. Use the 0.08 significance level.
Researchers have determined that patients who are smokers have 18% chance of contracting a serious illness. What is the probability that a given patient if the patient has a serious illness?
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