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1. Using a sample of 26 twelve-year-olds from diverse backgrounds, a researcher conducts an exploratory study of the relationship between self-esteem and socioeconomic status. She obtains a sample correlation of r = 12.
(a) Specify the statistical hypotheses.
(b) Specify the critical r value and statistical decision (α= 05).
(c) Draw final conclusions.
2. Suppose that the researcher in Problem 4, while presenting her results at a conference, said the following: "Interestingly, the obtained correlation was negative. That is, there is a slight tendency for children of higher socioeconomic backgrounds to be lower in self-esteem." What would be your response to this interpretation?
A null hypothesis isp>0.65. To test this hypothesis, a sample of 400 is taken and alpha is set at 0.05. If the true proportion isp = 0.60, what is the probability of a type II error
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A. Create the probability distribution table for grade points for this professor. B. Find the mean of this probability distribution and provide and interpretation of this mean. C. Find the variance and standard deviation.
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what is the purpose of having two t test? why not just be able to conduct a t test for either independent or
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A colleague measures the following heights (in inches) of 10 CEOs selected at random: 72, 75, 75, 66, 64, 79, 79, 75, 70, and 72.
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Please calculate the 95% standard deviation for each department and indicate for me if any department is receiving on average $2k or more on the high end.
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