When should the Wilcoxon Signed-Rank test be used instead of a paired t-test?
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Q: What is the null hypothesis in the Wilcoxon Signed-Ranks Test?
A: Given information: Wilcoxon Signed-Ranks Test
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Q: An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans…
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Q: What is the interpretation of the results from the Wilcoxon Signed-Ranks Test?
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- Do the data support the hypothesis that oligofructose facilitates calcium obsorption? What is the test statistic? Do the data support the hypothesis that oligofructose facilitates calcium obsorption? What is the degrees of freedom of the test?A two-tailed test at a 0.1031 level of significance has z values of a. -1.63 and 1.63 O b. -0.82 and 0.82 Oc.-0.82 and 0.82 Od. -1.26 and 1.26 Show All FeedbackWhat would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?
- What is the formula used to calculate the Wilcoxon Signed-Rank test statistic?I’m interested in seeing whether or not online supplementary material helps students achieve higher grades in statistics. I assign 10 students into a class using an online textbook resource whereas 10 separate students are assigned into a class using just the textbook. I record their final course average (final course grade). Using the following data (testing at an alpha of .05), assess whether those that used the online resources + textbook (group 1) did better than those just using the textbook (group 2). Online resources + Textbook (group 1) Just textbook (group 2) 95 90 90 86 92 75 92 87 84 85 86 83 91 90 92 83 80 85 82 78 Independent variable: _______________________ Dependent variable: _________________________ Null (H0): ________________________________ Alternative (Ha): ________________________________Researchers have collected data on the rate of BO disease from a random sample of persons across the country aged 50 and above (n = 250). In particular, researchers are curious in studying a claim made by the cig industry that there is a negative relationship between smoking cigarettes and the risk of contracting BO’s. The researchers have calculated a Pearson’s r correlation of −.709 for the two variables. The researchers have also calculated (using a computer) a significance value of .005.In a paragraph of five to six sentences, based on the results from the correlation, what conclusions can the researchers make about the relationship between smoking and getting BO’s? Ensure that you mention the unit of analysis, the direction of the relationship, the strength of the relationship, whether the findings are statistically significant, and how accurately the results would reflect the population. Do these findings support the cig industry’s claim? Why or why not?
- Conduct a realted-sample t-test using the following data set. Each row represents a pairof scores A B 18 4 35 40 31 14 30 18 40 30 25 27 11 17 30 18 28 12 20 20 determine critical values (for an alpha of .05) that you should use to evaluate this t-score and compute r^2 for this test.When should the Wilcoxon Signed-Ranks Test be used instead of the paired t-test?A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
- A researcher wants to compare the effectiveness of two treatments on a sample of 25 patients. What is the null hypothesis for the Wilcoxon Signed-Ranks Test?It is known that for right-handed people, the dominant (right) hand tends to be stronger. For left-handed people who live in a world designed for right-handed people, the same may not be true. To test this, muscle strength was measured on the right and left hands of a random sample of 15 left-handed men and the difference (left - right) was found. The alternative hypothesis is one-sided (left hand stronger). The resulting t-statistic was 1.80. Assuming the conditions are met, based on the t-statistic of 1.80 the appropriate conclusion for this test using α = .05 isA random sample of 100 freshman showed 6 had satisfed the university mathematics requirement and a second random sample of 50 sophomores showed that 13 had satisfied the university mathematics requirement. Enter answers below rounded to three decimal places. (a) The relative risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is (b) The increased risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is
