6.Which of the following statements is/are true?I.Correlation and regression require that there are clearly-identified explanatory andresponse variables.II.Scatterplots require that both variables be quantitative.III. Every least-squares regression line passes through( ,).x y

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7.There is an approximate linear relationship between the height of females and their age (from5 to 18 years) described by predicted height = 50.3 + 6.01(age)where height is measured incentimeters and age in years. Which of the following isnotcorrect?

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8.You are interested in predicting the cost of heating houses on the basis of how many roomsthe house has.A scatterplot of 25 houses reveals a strong linear relationship between thesevariables, so you calculate a least-squares regression line.“Least-squares” refers to

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© 2011 BFW PublishersThe Practice of Statistics, 4/e- Chapter 3127