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Practice Set 5

# Practice Set 5 - Length X(mm Maximum Jump Y(cm 70 136 100...

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Multiple choice set 5 Q 1. The following Minitab output was obtained for Time to Response to 911 calls data: Test of mu = 4.5 vs not = 4.5 Variable N Mean StDev SE Mean 95% CI T P Time 41 5.82927 4.96942 0.77609 (4.26073, 7.39781) 1.71 0.094 For which values of the confidence level can we reject the hypothesis that the average time to response is 4 . 5? (a) 90% (b) 95% (c) 99% (d) all three (e) none Solution to Q1: P -value is 0.094. Thus, if α = 0 . 1 we reject H 0 . We do not reject H 0 when α = 0 . 05 or α = 0 . 01. Now, confidence level is 1 - α . Therefore, we reject for 90% confidence level, and do not reject for 95% and 99%. Q 2. Scientists studied the relationship between the length of the body of a bullfrog and how far it can jump. Four bullfrogs were included in the study. The results are given in the table.

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Unformatted text preview: Length X (mm) Maximum Jump Y (cm) 140 71 127 70 136 100 135 120 What is the regression line? (a) Y =-23 . 8 + 0 . 848 X (b) Y = 131-. 043 X (c) Y = 159 . 988-. 504 X (d) Y =-. 504 + 138 X (e) none of the preceding Solution to Q2: The answer follows by applying formulas from page 5 of slides for Chapter 12. Q 3. For data in Question 2 we have the following MINITAB output: Predictor Coef SE Coef T P Constant-23.8 415.5-0.06 0.959 C1 0.848 3.087 0.27 0.809 The P-value for the signicance of regression test is (a) 0.959 (b) 0.809 (c) 0.27 (d)-0.06 (e) none of the preceding Solution to Q3: Read the output. Solutions to multiple choice questions: Q1- a Q2- a Q3- b...
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