Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and results are given for Friday the 6th and Friday the 13th in the same month. Use the Wilcoxon signed-ranks test to test the claim that the matched pairs have differences that come from a population with median equal to zero at a significance level of a=0.05. Fri. 6th 6 6 10 13 6 Fri. 13th 8 Click to view a table of critical values for the Wilcoxon signed-ranks test. 10 14 5 D 12 12 10 First define the null and alternative hypotheses.

Test the hypothesis that the sample mean is not a good estimator for the population mean. State your null and alternative hypothesis Determine your alpha and critical value Calculate your test statistic Calculate your P-value Determine your result. JP_Sales 0.25 0.61 0.31 1.42 0 1.15 0 1.04 0 0.42 1.15 0.69 0.21 0 1.69 0.15 0.02 0.57 0.83 0.11 Population Mean Population Standard Deviation 0.048235826 0.164835106

Statistics Hypothesis Testing One Sample H₂: o=5 1. Ho: μ = 50 n = 36 xbar = 49 2. Ho: μ>= 170 n = 16 H₂: xbar = 165 s = 10 significance level = 0.05 _crit: _stat = _crit = α = significance level = 0.10 stat = pvalue= α = pvalue = tail tail

Find critical value(s) and identify the rejection region  find the standardized test statistic z  decide whether to reject or fail to reject the null hypothesis interpret the decision in the context of or

ICA 7-A t test 4 individuals were tested in the Memory test in the congruent condition & another 4 individuals were tested in the incongruent condition. pooled Is there a difference between conditions? What is the 95% confidence interval of the mean difference? What is the effect size? (n, − 1)Ŝ²ª + (n − 1)Ŝ² (n, -1) + (n₂-1) Cl = Mean Difference + tcritical (Sx₁-x₂) d = Mx - My S Subject pooled 1 2 3 4 5 6 7 8 S= Total Score (X) 10 6 9 3 20 3²= 12 15 9 Σ(X-M)² (N-1) Sx₁-8₂ Σ(X-M)² (N-1) Group 1 1 1 1 2 2 2 2 X₁ - X₂ t=-A ST X1-X₂ [(n − 1)² + (n₂ − 1)²](1,1 - + (n-1) + (n₂-1) n n₂