A psychologist asked a random sample to complete a depression questionnaire. On average, children have a score of 20. Does the sample of children differ from children in general? Children Depression Score 19 20 C 18 D 19 E 21
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- A researcher surveyed 500 people. She found that the individuals who took some form of over the counter sleep aid (i.e. ZZZQuil) were able to fall asleep in a shorter period of time and stay asleep for longer periods than the individuals who did not. a) Was this study observational or experimental? Why?b) What was the explanatory variable? What was the response variable?A researcher randomly selected a sample of n = 500 individuals from a population with µ = 120 and administered an experimental treatment to the sample. What the researcher should expect if the treatment has no significant effect?The table below summarizes a data set that examines the responses of a random sample of college graduates and non-graduates on the topic of oil drilling. Complete a chi-square test for these data to check whether there is a statistically significant difference in responses from college graduates and non-graduates. That is, H0:H0: The opinion of college grads and nongrads is not different on the topic of drilling for oil and natural gas off the coast of California.HA:HA: Opinions regarding the drilling for oil and natural gas off the coast of California has an association with earning a college degree. Compute the expected counts. If necessary, round to the nearest tenth. College graduates Non-graduates Total Support 154 132 286 Oppose 180 126 306 Do not know 104 131 235 Total 438 389 827 College graduates Non-graduates Total Support 286 Oppose 306 Do not know 235 Total 438 389 827 b) Compute the χ2χ2 test statistic. Round to the nearest…
- Researchers are interested in the effectiveness of a new anti-retroviral medication at increasing 5 year survival for HIV infected persons with Hepatitis C. In order to test the efficacy of the new study drug, the researchers randomly assigned participants to receive either the new medication or a placebo. The following table summarizes preliminary results of the trial. Deceased Non-Deceased Total New Vaccine 55 84 139 Placebo 61 67 128 Total 116 151 267 A) Calculate the relative risk for mortality among those treated with the new vaccine versus the placebo. B) Interpret the relative risk measurement.A large research project showed that in a sample of 750 adults, 60 of them experienced a midlife crisis . Use this data to test the claim that the percentage of adults who experienced midlife crisis is less than 10%. Use (alpha)= 0.05 .In this study, ten combat veterans undergoing treatment for PTSD were randomly sampled from a local VA hospital in a study designed to test the efficacy of an anti-anxiety medication in reducing the symptoms of PTSD. Based on clinical animal trials, the researchers predict that the drug should reduce symptoms. t= 1.63, df=9, p=0.064, d= 0.529. Before: M= 48.100, SD=1.370, SE=0.433 After: M= 47.000, SD= 1.491, SE= 0.471 My hypotheses are; H0: μbefore ≤ μafter. H1: μbefore > μafter A. State your findings in APA format: B. How would you explain these findings to someone who has never taken a statistics class? In other words, use clear direct, non-jargon language to explain the results:
- New research suggests that the occurrence of celiac disease in a subject depends on the subject’s gender and whether the subject already has another autoimmune disorder (such as Hashimoto disease and/or Type I Diabetes). Researchers collected information from 860 patients complaining of gastrointestinal discomfort. data celiac; input gender $ hashimoto $ t1diabetes $ positive total; cards; female yes yes 27 124 female yes no 21 133 female no yes 22 117 female no no 16 109 male yes yes 14 95 male yes no 14 87 male no yes 9 97 male no no 11 99 ; run; title "Logistic model with gender"; proc logistic data=celiac; class gender (ref='male') / param=ref; model positive/total = gender; run; title "Logistic model with gender adjusted for presence of autoimune (t1diabetes and hashimoto) diseases"; proc logistic data=celiac; class gender (ref='male') / param=ref; class hashimoto (ref='no') / param=ref; class t1diabetes (ref='no') / param=ref; model positive/total = gender hashimoto…A pharmaceutical company wants to know whether an experimental drug has an effect on systolic blood pressure. Fifteen randomly selected subjects were given the drug and, after sufficient time for the drug to have an impact, their systolic blood pressures were recorded. The data appear below: 172140123130115 148108129137161 123152133128142172140123130115 148108129137161 123152133128142 Calculate the values of y¯¯¯y¯ and s for the 15 blood pressure readings.To examine the effects of pets and friends in stressful situations, researchers recruited 45 people to participate in an experiment. Fifteen of the subjects were randomly assigned to each of three groups to perform a stressful task alone (control group), with a good friend present, or with their dog present. Each subjects mean heart rate during the task was recorded. Higher heart rates mean more stress. Use an alpha of .05. Control Pets Friends n1=15 n2=15 n3=15 M1=82.52 M2=73.48 M3=91.33 s1=9.24 s2=9.97 s3=8.34 SS1=1195.29 SS2=1391.61 SS3=973.78 SSbetween = 2389.80 a) What are the hypotheses for this test?b) What is the critical valuec) Complete the necessary calculations (include post hocs if necessary) .d) Report your results in APA stylee) Interpret the results and include a source table.
- To examine the effects of pets and friends in stressful situations, researchers recruited 45 people to participate in an experiment. Fifteen of the subjects were randomly assigned to each of three groups to perform a stressful task alone (control group), with a good friend present, or with their dog present. Each subjects mean heart rate during the task was recorded. Higher heart rates mean more stress. Use an alpha of .05. Control Pets Friends n1=15 n2=15 n3=15 M1=82.52 M2=73.48 M3=91.33 s1=9.24 s2=9.97 s3=8.34 SS1=1195.29 SS2=1391.61 SS3=973.78 SSbetween = 2389.80 a) What are the hypotheses for this test?b) What is the critical valueTo examine the effects of pets and friends in stressful situations, researchers recruited 45 people to participate in an experiment. Fifteen of the subjects were randomly assigned to each of three groups to perform a stressful task alone (control group), with a good friend present, or with their dog present. Each subjects mean heart rate during the task was recorded. Higher heart rates mean more stress. Use an alpha of .05. Control Pets Friends n1=15 n2=15 n3=15 M1=82.52 M2=73.48 M3=91.33 s1=9.24 s2=9.97 s3=8.34 SS1=1195.29 SS2=1391.61 SS3=973.78 SSbetween = 2389.80 e) Interpret the results and include a source table.To examine the effects of pets and friends in stressful situations, researchers recruited 45 people to participate in an experiment. Fifteen of the subjects were randomly assigned to each of three groups to perform a stressful task alone (control group), with a good friend present, or with their dog present. Each subjects mean heart rate during the task was recorded. Higher heart rates mean more stress. Use an alpha of .05. Control Pets Friends n1=15 n2=15 n3=15 M1=82.52 M2=73.48 M3=91.33 s1=9.24 s2=9.97 s3=8.34 SS1=1195.29 SS2=1391.61 SS3=973.78 SSbetween = 2389.80 c) Complete the necessary calculations (include post hocs if necessary) .d) Report your results in APA style
