he aim of a study is to test the ratio of variances in the weight of two groups of rats being under a certain drugs A ( group 1) and B ( group 2). A random sample of 17 rats was selected from group 1and 11 rats from group 2, Then their weight were recorded. The results are shown in the following table sd Median Mean n 1.05 3.0 3.5 17 group 1 1.15 2.0 2.20 11 group 2 F19.16,0.025=0.386 F15,12,0.05 =0.404 F16.10,0.025=0.335 F19,16,0.05=0.451 F15,12,0.1 0.496| F16,10,0.05 =0.401 F16,19,0.025 0.371 F12.15,0.05 =0.382 F10,16,0.0025 =0.286| F16.19,0.05=0.437 F1215,01=0.475 F10,16,0.05 =0.354 Construct a 95% confidence interval for the ratio of the variances. [ Write only the final result in the box below

In an analysis of variance study (ANOVA) , individuals were separated to two groups to test the effect of a specific medicine on blood pressure. Each group consisted of 5 individuals, and blood pressure was recorded for each . Choose the correct statement : 15 Select one: 22 a. Factor : blood pressure, Treatments : group 1, group 2, Response variable : Medicine type O b. Factor: Medicine type, Treatments : group 1, group 2, response variable : blood pressure 29 c. Factor : group 1, group 2, Treatments : blood pressure, Response variable : Medicine type 36 O d. Factor : Medicine type, Treatments: blood pressure , Response variable : group 1,group 2 Finis ge Next page CTIVITY NEXT ACTIVITY Jump to... Midterm 1 étv Ps Lr Ai T

Dr. Z divides her clients with depression into 2 groups. She asks Group 1 not to watch or read any news for two weeks while in therapy and asks Group 2 to continue with therapy as normal. The groups scored the following on measure of depression: Measure of Depression: Group 1: 34, 25, 4, 64, 14, 49, 54 Group 2: 24, 78, 59, 68, 84, 79, 57 t-Test: Two-Sample Assuming Equal Variances         Variable 1 Variable 2 Mean 34.85714 64.14286 Variance 483.4762 418.4762 Observations 7 7 Pooled Variance 450.9762   Hypothesized Mean Difference 0   df 12   t Stat -2.57996   P(T<=t) one-tail 0.01205   t Critical one-tail 1.782288   P(T<=t) two-tail 0.0241   t Critical two-tail 2.178813     State the null hypothesis and the directional (one-tailed) alternative hypothesis. Can you reject the null hypothesis at α = .05? Explain why or why not.