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Study on the enhancing effects of coffee on long-term memory found that 35 participants given 200 mg of caffeine performed better on a memory test 24 hours later compared to the placebo group that received no caffeine. Use the given probability values to determine whether the sample results could easily occur by chance, and then form a conclusion.
a. There was a probability of 0.049 that difference between the coffee group and the placebo group was due to chance. What do you conclude?
b. A group given a higher dose of 300 gm performed better than the 200 mg group, with a probability of 0.75 that this difference is due to chance. What do you conclude?
A political strategist believes that less than 55% of voters in a certain state support a particular issue. He then commisions a poll of 500 voters and 54% of them support this issue. If = .05, is the political strategist's belief warranted?
Displays the number of vacation days
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The results are D‾ = 0.2 kilowatt and SD = 1.0 kilowatt. At α = 0.01, is there evidence to conclude that conservation efforts reduce consumption?
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give two suggestions regarding how a statistician might generate probability estimates when empirical data is
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