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The IQs of 17 students from one area of a city showed a mean of 106 with a standard deviation of 10, whereas the IQs of 14 students from another area showed a mean of 109 with a standard deviation of 7. Test for equality of variances between the IQs of the two groups at α = 0.02.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
A recent study yielded a positive correlation between breast-fed babies and scores on a vocabulary test taken at age 6. Discuss the potential difficulties in interpreting the results of this study.
a random sample of 16 students from the student body of a large university had an average age of 25 years and a sample
the average return for large-cap domestic stock funds over the three years 2009-2011 was 14.8. assume the three-year
a specific automotive part that a service station stocks in its inventory has an 8 chance of being defective. suppose
What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug X and the size of the tumor? Support your responses.
1.i plan an experiment to test the latest conflicting diet programs. the factor for diet will involve three different
Give a brief definition and an example of the following: What does the correlation coefficient r describe? What about r squared?
q1. explain the difference between multiple independent variables and multiple levels of independent variables. which
a test to detect pollutants is 90 accurate when pollutants are present in a sample and 96 accurate when pollutants are
At the 0.05 level of significance, do the samples provide sufficient evidence to indicate that on the average, fewer consumers prefer a new product when the spokesperson is male?
Generate a testable null statistical hypothesis and an alternative statistical hypothesis. Select an alpha level of .05, .01, or .001 and justify your choice.
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