What is the interpretation of the results from the Wilcoxon Signed-Ranks Test?
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Q: Say you get a test statistics of z = 2.15 and your alternative hypothesis is a two tails test. How…
A: Feel free to ask further question.
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A: N1 = 10 df1 = 10-1 = 9 M1 = 7.8 S1 = 1.2 N2 = 10 df2 = 9 M2 = 8.1 S2 = 1.6 t-statistics = ?
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A: Critical value: Critical value is the cut off point that divides the acceptance and rejection region…
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A: (a) State the hypotheses.
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: Determine both critical z-scores corresponding to a = 0.2 in a two-tail test. neg. crititical…
A: Solution: Given information: α=0.2 Level of significance Tow tailed test.
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Q: An article in the Washington Post on March 1616, 19931993 stated that nearly 45%45% of all Americans…
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Q: What would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?
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Q: An article in the Washington Post on March 16, 1993, stated that nearly 45 percent of all Americans…
A: Given,n=82x=30p^=xnp^=3082=0.366H0:p=0.45Ha:p≠0.45
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Q: What is the difference between the Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test?
A: The Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test are both non-parametric statistical tests…
Q: When should the Wilcoxon Signed-Ranks Test be used instead of the paired t-test?
A: When Wilcoxon signed ranks test instead of paired t-test.
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- Suppose I'm using chi-square analysis to determine the relationship, if any, between a pair of categorical variables. How should I interpret the results if I get a significant chi-square statistic but see that the high value is driven essentially by only a couple of cells in the crosstab? Is there a better way to proceed to get an imnproved understanding of what's going on? Thanks.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?An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans have brown eyes. A random sample of n=84 C of I students found 31 with brown eyes.We test H0:p=.45Ha:p≠.45 (a) What is the z-statistic for this test? (b) What is the P-value of the test?
- Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?An airport official wants to prove that the proportion of delayed flights for Airline A (denoted as p1) is less than the proportion of delayed flights for Airline B (denoted as p2). Random samples for both airlines after a storm showed that 51 out of 200 flights for Airline A were delayed, while 60 out of 200 of Airline B's flights were delayed. The test statistic for this problem is -1.00. The p-value for the test statistic for this problem is: p = 0.0228 p = 0.0668 p = 0.3413 p = 0.1587note for drop downs in last question: performed > (worse than, similarly to, better than) random guesses , so they > (do not appear, appear) effective.
- Can I use CRONBACH’S ALPHA in testing the reliability of the device? How?When should the Wilcoxon Signed-Rank test be used instead of a paired t-test?We are interested in comparing the proportions of men and women who say earning a large salary is very important to them. You surveyed 200 men and 200 women and recorded their answers to the question as “yes” (earning a large salary is very important) or “no” (earning a large salary is not very important). Yes No Total Men 150 50 200 Women 110 90 200 Total 260 140 400 Test the association between sex and the importance of earning a large salary using a z-test. Provide the null and alternative hypotheses, test statistic, p-value, and conclude test with 0.01 signifigance.
- A sociologist wishes to study whether the rank attained by officers in the New York City Police Department (NYPD) is related to gender. Data have been collected for both male and female officers in NYPD. The summary data and test for independence results from StatCrunch are given below. At a= 0.05 level of significance, draw a conclusion about whether these data indicate that the rank of the officer is independent of gender.(a) Is this an observational study or experiment?(b) What are the explanatory and response variables, respectively?Explanatory variable:Response variable:(c) Write down the null and alternative hypotheses of the test for independence.Contingency table results:Rows: RANKColumns: GENDER male female total officer 21900 4281 26181 detective 4058 806 4864 sergeant 3898 415 4313 lieutenant 1333 89 1422 captain 359 12 371 higher ranks 218 10 228 total 31766 5613 37379Citrus Rental is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage over the years for Citrus cars has been about 1600 miles per month. Recently, though, Citrus purchased thousands of new cars, and the company claims that the average mileage of its cars is now less than in the past. To test this, a random sample of 16 recent mileages of Citrus cars was taken. The mean of these 16 mileages was 1517 miles per month, and the standard deviation was 233 miles per month. Assume that the population of recent monthly mileages of Citrus cars is normally distributed. At the 0.05 level of significance, can it be concluded that the mean recent monthly mileage, μ, of Citrus cars is less than 1600 miles per month? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary,…A researcher wants to determine if there is a significant difference in the number of times a new treatment for a medical condition results in relief from symptoms compared to the standard treatment. They randomly assign 20 patients to receive the new treatment and 20 to receive the standard treatment, and record the number of times each patient experienced relief from symptoms in a given period of time. The researcher uses the Wilcoxon Signed-Ranks Test to analyze the data. What is the null hypothesis for this test?
