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Unformatted text preview: 1.The contingency table shown relates happiness and gender. Gender not too happy pretty happy very happy Total Females 227 939 527 1693 Males 163 737 393 1293 a. Identify the response variable and the explanatory variable. b Are females and males similar, or quite different, in their reported happi ness? c. Are the variables gender and happiness independent of each other? 1 2. The grades of a class of 9 students on a midterm report (x) and on the final examination are as follows: x 77 50 71 72 81 94 96 99 67 y 82 66 78 34 47 85 99 99 68 From the table we get the following values ∑ x i = 707, ∑ y i = 658, ∑ ( x i ¯ x ) 2 = 2018 . 22, ∑ ( y i ¯ y ) 2 = 3872 . 89, and ∑ ( x i ¯ x )( y i ¯ y ) = 1568 . 44 a) Find the regression line for the data. b. Do the data provide sufficient evidence to indicate that y and x are lin early related? c) Calculate the coefficient of determination? What conclusion can you draw?...
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This note was uploaded on 02/24/2011 for the course STAT 3022 taught by Professor Staff during the Spring '08 term at Minnesota.
 Spring '08
 Staff

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