What is the difference between the Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test?
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- The results of a mathematics exam at JUST university for two classes are as follows: Class 1: (n=32 , mean=12.6, SD=8) and Class 2: (n=36, mean=2.4, SD=12).we are testing if the means are different What is the z statistic (a=0.05): on О а. 1.7000 O b. 6.1237 O c. 3.7559 O d. 4.1641The local Hannaford was tracking the proportion of customers who bought flour in their stores. In mid-March they found that 65% of customers were buying flour when it was available. They want to know if that percentage has decreased now that flour is more readily available. Their hypotheses are: Ho: ρ ≥ .65 and Ha: ρ < .65. They sample 200 customers and found that 120 of them bought flour. What is the computed test statistic? Calculate the z or t, whichever is appropriate, and give the result rounded to 2 decimal places. If it's a negative number, put the negative sign before the number with no spaces between it and the number.The data below are from a study comparing three different treatment conditions: Treatment 1 Treatment 2 Treatment 3 0 1 6 1 4 5 0 1 6 3 2 3 T = 4 T = 8 T = 20 SS = 6 SS = 6 SS = 6 N = 12 G = 32 ƩX2= 138 Conduct a single-factor independent-measures ANOVA to test the hypothesis that there are significant differences in the mean scores among the three treatment conditions. Use α = .01. a. The alternative hypothesis is
- List a detailed step by step guide you would take to determine if your data is statistically significant if you were to calculate the U stat using the following two methods below: n1(n1 + 1) R1 nịn2 + 2 Vs: n1(n1 + 1) R1 –When should the Wilcoxon Signed-Rank test be used instead of a paired t-test?State the Result: A hypothesis test was conducted at the alpha = 0.01 level of significance. The test resulted in a p-value of 0.044.
- Prior to an intensive TV advertising campaign, the producers of Nike athletic shoes find that 29 of a random sample of 200 upper-income adults are aware of their new leisure shoe line. A second random sample of 300 such adults is taken after the campaign. Now 96 of the persons sampled can identify the new line. Is the increase in the proportion of upper income adults showing brand awareness significant? Test the claim using alpha = .05.If you collect data from a random sample of 10 students and we would like test for statistical significance at the 0.05 level, what critical r value must be obtained? O .602 O.632 0.708 O .576You wish to test the following claim (HA) at a significance level of α=0.001. H0:p1=p2 HA:p1≠p2You obtain 462 successes in a sample of size n1=671 from the first population. You obtain 484 successes in a sample of size n2=629 from the second population.What is the test statistic for this sample? (Report answer accurate to three decimal places.)test statistic = What is the p-value for this sample? (Report answer accurate to three decimal places.)p-value = The p-value is... less than (or equal to) α greater than α This test statistic leads to a decision to... reject the null accept the null fail to reject the null As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the claim that the first population proportion is not equal to the second population proprtion. There is not sufficient evidence to warrant rejection of the claim that the first population proportion is not equal to the second population proprtion. The sample data…
- What is the result of the chi square test of independence given in the SPSS output (test statistic, p-value)? (Hint: I have placed a green box around the correct row in the chi-square test table.) What does the chi square test statistic tell you about the association between one’s level of education and one’s level of disagreement with the statement (assume alpha=0.05), and what does it not tell you? test statistic: p-value: Conclusions:Let’s say that I want to test a hypothesis that drivers who are pooled over driving a sports car receive speeding fines that are higher than drivers operating other types of cars. Using a large sample (n over 30), I find that Zobt=1.87 Is this difference statistically significant (i.e., would I reject the null) at α=0.05 level? Why/why not?A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who subscribe to Sporting News. A random sample of n, = 86 urban residents showed that r, = 14 subscribed, and a random sample of n, = 97 suburban residents showed that r = 20 subscribed. Does this indicate that a higher proportion of suburban residents subscribe to Sporting News? Use a 5% level of significance. What are we testing in this problem? O difference of means O difference of proportions O paired difference O single mean O single proportion (a) What is the level of significance? State the null and alternate hypotheses. O Ho: P1 P2 O Ho: P1 = P2i H1: P1 0.250 O 0.125 < P-value < 0.250 O 0.050 < P-value < 0.125 O 0.025 < P-value < 0.050 O 0.005 < P-value < 0.025 O P-value < 0.005
