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- Does St. John wort (an herb) have a siginifact effect in treating major depression? A study looked at 340 adult outpatients suffering as measured by their HAM-Dscore, randomly assiging each subject to either a placebo, St.John's wort, or a second active treatment for comparison. The study found the diiference in treating major depression as measured by improvement in HAM-D scores between St.John's wort and the placebo was not statistically significant This means that: A. a difference this big could easily occur just by chance even if St. John's wort does not better than the placebo B. We cannot make a 95 percent confidence statement C.The placebo makes no difference in the subjects' depression D. The study was badly designedDistinguish briefly the T-test and ANOVAWhat source of variation is found in an ANOVA summary table for a within subjects design that is not in an ANOVA summary table for a between subjects design. What happens to this source of variation in a between-subjects design?
- A researcher collects data from a sample of children with Crohn's disease and then compares that data to data collected from a sample of children without the disease. What type of study design is the researcher using for this study? Cohort Cross-sectional Quasi-experimental Case-ControlA small pilot study is run to compare a new drug for chronic pain to one that is currently available. Participants are randomly assigned to receive either the new drug or the currently available drug and report improvement in pain on a 5-point ordinal scale: 1=Pain is much worse, 2=Pain is slightly worse, 3= No change, 4=Pain improved slightly, 5=Pain much improved. Is there a significant difference in self-reported improvement in pain? Use the Mann-Whitney U test with a 5% level of significance. Please show work. New Drug: 4 5 3 3 4 2 Standard Drug: 2 3 4 1 2 3A researcher is studying whether average GPA is dependent on whether the students are in a 2-year college, public university, or private university. The researcher should use a 1-way ANOVA for this study. True or false
- The manager of a concert production company analyzes a regression relating ticket sales to the independent variables "spending on advertising" and "unemployment rate" in the region. The regression was based on a random sample of 30 observations. She computes the D-W statistic to be 1.2 to determine if positive autocorrelation might be a problem. At the 5% significance level, what can we conclude? Multiple Choice We do not reject the null hypothesis and conclude there is likely no autocorrelation. We reject the null hypothesis and conclude there is likely positive autocorrelation. he test is inconclusive. We cannot say whether positive autocorrelation exists. We reject the alternate hypothesis and conclude that there is likely no positive autocorrelation.Suppose in a randomized controlled experiment of the effect of a SATpreparatory course on SAT scores, the attachment includes results are reported:a. Estimate the average treatment effect on test scores.b. Is there evidence of nonrandom assignment? Explain.A group of cognitive psychologists were interested in testing whether learning in the testing environment improves memory retention (i.e, test scores) in a scuba diving class. To test this, the experimenters manipulated learning location such that half learned the material in a pool. in addition, the experimenters manipulated testing location such that half. of the class were tested in the classroom and half were tested in the pool. thus, a 2X2 design was used. Which statistical test should be used? a. one way between subjects ANOVA b. one way repeated measures ANOVA c two way between subjects ANOVA d. none of these options
- A clinical trial is conducted to compare a new pain relief for arthritis to a placebo. Participants are randomly assigned to receive the new medication or a placebo, and the outcome is pain relief within 30 minutes. The data are shown in Table 7–8. Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance. (Use Excel)A new math program was evaluated using four groups of students. Treatment group 1 had 10 elementary students. Treatment group 2 had 12 middle school students. Treatment group 3 had 10 high school students, and treatment group 4 had 15 students that were homeschooled. Complete the ANOVA table below and use it to conduct a 4-step hypothesis (ANOVA) test to determine if there is sufficient evidence to conclude the new math program made a significant change in mean scores at α=.05 source of variation SS df MS F treatment 360 error 516 total On all hypothesis test: 1) clearly state the null and alternative hypotheses; 2) sketch a graph of the rejection region labeled with the critical value; 3) calculate the test statistic (showing work) and p-value (give a range for t, chi-square, and F), and 4)using evidence state a detailed conclusion.A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a pla- cebo. Before starting the trial, a pilot study is conducted involving seven participants. The objective of the study is to assess how systolic blood pressure (SBP) changes over time if left untreated. SBP is measured at baseline and again 4 weeks later. Is there a statistically significant difference in SBP over time? Run the test at a 5% level of significance. Baseline 120 145 130 160 152 143 126 Four weeks 122 142 135 158 155 140 130 how do I solve this in excel?