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Sadness and spending
A study of sadness and spending randomized subjects to watch videos designed to produce sad or neutral moods. Each subject was given $10, and after the video they were asked to trade $0.50 increments of their $10 for an insulated bottle of water. Here are the data:
(a) Use the two-sample t significance test (page 394) to compare the means of the two groups. Summarize your results.
(b) Use the pooled two-sample t significance test (page 447) to compare the means of the two groups. Summarize your results.
(c) Use a permutation test to compare the two groups. Summarize your results.
(d) Discuss the differences among the results you found for parts (a), (b), and (c). Which method do you prefer? Give reasons for your answer.
All possible combinations must be tested to see which gives the best yield - How many tests must be performed show all step?
Does the Christian faith have anything distinctive to say about the practice of statistics as a science?
A random sample of 160 car crashes are selected and categorized by age. The are listed below. The age distribution of for the given categories is 18% for under 26, 39% for 26-45, 31% for 46-65, and 12% for over 65.
If two registered voters are selected at random, what is the probability exactly one voter is a democrat?
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What is the slope of the regression equation developed when the Sales data are used to predict the Pounds and what is the seasonal factor for the third quarter?
the weekly demand for a product is believed to be normally distributed. compute the degrees of freedom. use ?0.10. the
Sprinkler Systems. A manufacturer of sprinkler systems designed for fire protection claims that the average activating temperature is at least 135 degrees F.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
the admissions staff asked graduates outside their immediate area and outside the state to help with recruiting. in
question an opportunity sample of 50 undergraduate students was asked to complete a series of personality
Dr. Justin Case wants to explore whether or not students perform better if they cram for a test (massed practice) or if they space their studying over weeks (distributed practice).
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