STAT 216 Final: STAT 216 Montana State SolutionsMPFinal
Document Summary
Final exam - spring 2005 - answers: false, false, true, false, true, true, false, false, true, true, d, d, b, c, a, c, c, d, a, d, b, d, d, a, d. Mu(x+y) = mu(x) + mu(y) = 11 + 20 = 31 seconds. Sigma(x+y) = sqrt[sigma(x)^2 + sigma(y)^2] = sqrt[2^2 + 4^2] = sqrt[20] = 4. 47 seconds: z = (418 - 533)/115 = - 1. 00. P(x < 418) = p(z < - 1. 00) = 0. 1587: bias variability. Least squares line: yhat = 37108. 8 + 11. 8987(x) C. ) confidence interval: 11. 8987 +/- 2. 120(6. 02) (- 0. 8637, 24. 6611) We are 95% confident that for each one square foot increase in house size, the true mean response in assessed value of houses in ithaca ny changes by between - 0. 8637 and 24. 6611 dollars. D. ) hypotheses: ho: b1 = 0 versus ha: b1 =/= 0. E. ) test statistic: t = ( 11. 8987)/6. 02 = 1. 9765.
