STAT 205 Quiz: STAT 205 South Carolina Quiz9 key
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Stat 205 quiz 9: (3 points) suppose a 95% con dence interval for 1 2 is ( 3. 1, 1. 7). Answer: since the hypothesized difference of zero is not in the 95% con dence interval, we reject h0 at the 5% level. Because we reject, we know that the p-value is less than 0. 05: (7 points) an entomologist conducted an experiment to see if wounding a tomato plant would induce changes that improve its defense against insect attack. She grew larvae of the tobacco hornworm on both wounded and control plants. The table below has summary statistics from the two groups of larval weights (mg) after a week of growth. Let ha be that wounding the plant diminishes larval growth. Construct the appropriate statistic ts and report a p-value (perhaps by bounding), from a t-test. Carry out the test at the = 0. 05 level. Larval growth on larval growth on wounded plants control plants n.
