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Assignment 2

# Assignment 2 - MGCR 271 Assignment 2 Winter 2011 MGCR 271...

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Unformatted text preview: MGCR 271 Assignment 2 Winter 2011 MGCR 271: Business Statistics Assignment 2 (Due: 6 March 2011) 1. (10 points) Forced vital capacity (FVC) is the volume (in milliliters) of air that an individual can exhale in 6 seconds. FVC was obtained for a sample of children not exposed to parental smoking and a group of children exposed to parental smoking. We want to know whether parental smoking decreases children’s lung capacity as measured by the FVC test. Smoking Count Mean Variance Yes 30 75.5 86.5 No 30 88.2 228 (a) (3 points) Construct a 95% confidence interval for the difference in FVC in the two groups. The confidence interval for the difference in FVC in the two groups is given by (¯ x 1- ¯ x 2 ) ± t * q s 2 1 n 1 + s 2 2 n 2 . Substituting the appropriate values, we get the confidence interval as- 12 . 7 ±- 2 . 05 × 3 . 24, which simplifies as (-6.08,-19.32). (b) (2 points) State the null and alternative hypotheses only using letters and mathematical symbols....
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Assignment 2 - MGCR 271 Assignment 2 Winter 2011 MGCR 271...

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