Statistics 13C HWK # 9 For discussion, 12/2/08 F. J. Samaniego From the text: Regression -- Chapter 12, # 73 a, c, 74 a, b, c, f; The paired t test -- Chapter 10, # 89, 109 (test using α = .05). Also, solve the following problems. (The Chi-Square “Goodness of Fit” test needed for solving problems 2 and 3 below will be the subject of next Monday’s lecture. This material is not in our textbook, though Table 5, containing cutoff points for the Chi-Square distribution, will be utilized.) 1. Let X = the number of classes UCD students are taking this quarter and let Y = the number of aspirin tablets they consume per week. A random sample of seven students yielded the following data. X 2 3 3 4 5 5 6 Y 2 2 3 4 6 8 10 (a) Compute r and use it to test H0 : ρ = 0 vs. H 1 : ρ ≠ 0 at α = .05. (b) Find the least squares line for the data above. 2. The Registrar at Icey U. selects classrooms for a four section course offering based on the assumption that students will choose a section at 8 AM, 10 AM, noon and 2PM in the
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