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A sample of 548 ethnically diverse students from Massachusetts were followed over a 19-month period from 1995 and 1997 in a study of the relationship between TV viewing and eating habits (Pediatrics [2003]: 1321-1326). For each additional hour of television viewed per day, the number of fruit and vegetable servings per day was found to decrease on average by 0.14 serving.
a. For this study, what is the dependent variable? What is the independent variable?
b. Would the least-squares line for predicting number of servings of fruits and vegetables using number of hours spent watching TV as a predictor have a positive or negative slope? Explain.
Use the .05 significance level and the six-step hypothesis-testing process to check if there is a difference in the mean flight times among the three airlines.
In a random sample of 40 days, the mean tons/employee hour was 4.99. Assume σ = 1.14. Find a 95% confidence interval for the true mean tons/ employee hour.
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