Chapter 10 presented methods for comparing means for two groups. Explain how it’s possible to perform a significance test of equality of two population means as a special case of a regression analysis. (Hint: The regression model then has a single explanatory variable—an indicator variable for the two groups being compared. What does μ1 = μ2 correspond to in terms of a value of a parameter in this model?)
Answer to relevant QuestionsLet y = death rate and x = average age of residents, measured for each county in Louisiana and in Florida. Draw a hypothetical scatterplot, identifying points for each state, such that the mean death rate is higher in ...The CEO of a company that owns five resort hotels wants to evaluate and compare satisfaction with the five hotels. The company’s research department randomly sampled 125 people who had stayed at any of the hotels during ...A psychologist compares the mean amount of time of rapid-eye movement (REM) sleep for subjects under three conditions. She randomly assigns 12 subjects to the three groups, four per group. The sample means for the three ...For the previous exercise, show a hypothetical set of population means for the four groups that would have a. A dose effect but no drug effect. b. A drug effect but no dose effect. c. A drug effect and a dose effect. d. No ...Refer to Example 12, the sample means from which are shown again below. a. Explain how to obtain the following interpretation for the interaction from the sample means: “For females there is no race effect on ideology. For ...
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