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1. The covariance between X and Y is -72, Sx = 8 and Sy = 11. What is the value of r?
2. r = -47, Sx = 6 and Sy = 4. What is the covariance between X and Y
3. For a particular set of scores, Sx = 3 and Sy = 5. What is the largest possible value of the covariance? Remember that r can be positive or negative.
Medical tests were conducted to learn about drug-resistant tuberculosis. Of 142 cases tested in NJ, 9 were found to be drug-resistant. Of 268 cases tested in Tx, 5 were found to be drug-resistant.
Make a decision – For the purpose of this discussion, you will make a conclusion based on the hypothetical results from Step 4. Be sure to include a recommendation on the effectiveness of the new drug based on the results.
At the .01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students?
Explain how the binomial distribution could be used in quality control to sample 50 parts in a lot of 500. binomial distrbution
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
Do the sample data present sufficient evidence to reject the manufacture's claim? Test using a a=0.05. What is the p-value of the test.
Discuss the reason that sampling distribution of the mean follow a normal distribution for a large enough sample size, even though the population may not be normally distributed?
The following frequency distribution was obtained. The data values are in hours. Construct a histogram for the data .
The following table shows SAT scores (on the old SAT with only two sections) for a sample of students. Give the equation of the least squares regression equation.
Can you conclude that information in article is untrue? Use 0.05 significance level. Find out p-value and explain its meaning.
Using given data table, find out midpoint for class with greatest frequency?
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