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Unformatted text preview: Show me your work. (4pts) a. M = 14.22 S = .93 S x 1.96 = 1.82 Interval is 12.4 – 16.04 5. State the null hypothesis for (4pts): a) An experiment testing whether echinacea decreases the length of colds. b) A correlational study on the relationship between brain size and intelligence. c) An investigation of whether a self-proclaimed psychic can predict the outcome of a coin flip. d) A study comparing a drug with a placebo on the amount of pain relief. (A one-tailed test was used.) 6. Is it more conservative to use an alpha level of .01 or an alpha level of .05? Explain. (1pt) It is more conservative to use an alpha level of .01 because you are taking a more strict stance on what data is considered to be significant....
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- Spring '08
- 2pts, 4pts, 1pt, 3pts