# Assignment 9 Answers - 11 70.11 12 increases decrease 13 R...

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QBA 2305 – Answers to Assignment 9 1. Sales 2. Circulation; it has the highest correlation with Sales. 3. The correlation coefficient between Circulation and Sales is 0.837 which is  greater than the 5% critical value equal to 0.312. This means that Circulation  and Sales should be considered significantly correlated. This means that  Circulation and Sales are significantly linear (straight line) related (i. e., a  straight line model will provide an accurate prediction of the Sales given the  amount of Circulation.)  4. y = 93.971x + 247.31 5. Yes; Circulation and Sales should be considered significantly, linear (straight  line) related at a 5% level of significance for the same reason given in  question (3) 6. About 94 units 7. About 74 to 114 8. About 435 9. About 371 to 499 10. About 45 to 825

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Unformatted text preview: 11. 70.11% 12. increases, decrease 13. R 2 = (0.837) 2 = .7011 14. Price is significantly, inversely related to sales. 15. R 2 = (-0.537) 2 = .2884 or 28.84% MegaStat Data Summaries Correlation Matrix Sales Circulation Size Price Sales 1.000 Circulation .837 1.000 Size-.191 -.219 1.000 Price-.537 -.156 .590 1.000 40 sample size ± .312 critical value .05 (two-tail) ± .403 critical value .01 (two-tail) Regression Analysis r² 0.701 n 40 r 0.837 k 1 Std. Error 189.970 Dep. Var. Sales Regression output confidence interval variables coefficients std. error t (df=38) p-value 95% lower 95% upper Intercept 247.3124 Circulation 93.9714 9.9527 9.442 1.64E-11 73.8232 114.1197 Predicted values for: Sales 95% Confidence Interval 95% Prediction Interval Circulation Predicted lower upper lower upper 2 435.255 371.464 499.047 45.426 825.084...
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Assignment 9 Answers - 11 70.11 12 increases decrease 13 R...

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