stat252 f00 exam2 - STAT 252 Exam 2 11.03.00 INSTRUCTIONS...

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Unformatted text preview: STAT 252 - Exam 2 11.03.00 INSTRUCTIONS: Please start each problem on a new page in your blue book. Be neat and show work for maximum credit. 1. The following data on illiteracy rate (y) and school enrollment rate (x) was collected for a random sample of states in the US. Regression Model Summary Std. Error Adjusted of the o R S uare Estimate mmmml 3- Predictors: (Constant). X ANOVA" X S - uares S uare F - 1 Regression 168.813 168.813 88.650 Residual 32.373 1.904 Total 201.185 8- Predictors: (Constant), X ssxx = 2049.6211 ssyy = 201.1352 ss,‘y = -588.2195 b - I J? = 66.0684 - Dependent Vanable. Y y = 5.7642 Coefficientsa n = 19 Standardi zed Unstandardized Coefficien Coefficients ts I! a 1 (Constant) 6.01615“ 2.039 12.139 .000 x - ’1 .030 v : 601i .000 3- Dependent Variable: Y . a. (5) Find the regression equation. b. (10) Find and interpret the correlation coefficent. c. (10) Does the data show that school enrollment is useful for predicting illiteracy rate? Test using a = 0.01 d. (10) Calculate a 95% prediction interval for illiteracy rate when enrollment is 75 percent (NOTE: don’t waste time interpreting) ' e. (5) Draw a happy face for 5 points ©. Keep going, you're doing a good job. 2. Data was collected for a random sample of hotels in California. The information obtained includes (y) daily rate (32), (x1) rating of the hotel (1 to 3 stars with 3 stars being the best), and (x2) number of rooms in the hotel. Regression Model Summary Std. Error Adjusted of the R Suare R Suare Estimate ) .33! 3- Predictors: (Constant , X1X2, X1, X2 ANOVA" Sum of Mean S uares df S - uare F Si - 1 Regression 4613347 3 1537.982 22.769 .OtillJ‘i Residual 2093.939 31 67.546 Total 6707.886 34 3- Predictors: (Constant), X1 X2, X1, X2 b- Dependent Variable: Y Coefficientsa Unstandardized Coefficients 8- Dependent Variable: Y a. (5) State the model used in the analysis. b. (10) Does the data provide evidence to suggest that the relationship between daily rate and number of rooms depends on hotel rating? Test using a = 0.05 c. (10) Estimate and interpret the rate of change in daily rate for a one room increase for a hotel with a 3 star rating. 3. Each of 36 men, while blindfolded, was asked to touch the foreheads of three women, one of whom was their spouse. The two “decoy” women were the same age, height and weight as the man's partner. Of the 36 men tested, 18 were able to correctly identify their spouse. Of course one would expect 12 of the 36 men to be correct if they were all guessing. a. (15) Do the data provide sufficient evidence to suggest that men will do differently, with respect to being correct, than if they were guessing? Test using a: = 0.05. 4. Data were collected randomly with respect to three different variables: y, x1, and x2. Assuming the model y = 130 + [3,x1 + file + g was fit. answer the following questions. a. (5) Identify (below) the appropriate ANOVA table for this analysis. ANOVA Sum of ‘ Snares of Mean Suare F 1 Regression 76536472330 4 19134118082 . Residual Total 60074292070 1 .3661 E+1 1 63236096916 ANOVA 1 Regression 750120356856 37506017843 Residual 615987287144 97 63503844035 Total 136610764400 99 ANOVA 1 Regression Residual Total 76501718347 601 09046053 136610764400 b. (10) Do the data show signs of multicollinearity? Justify and be specific. CoefficientsEl Standardi zed Unstandardized Coefficien Coefficients ts n (Constant) 38233.622 11414.054 1.952 .739 . . 1.155 . . . 3- Dependent Variable: Y \ c. (5) What seems like the most appropriate correlation coefficent between x1 and x2? x7“ ...
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