Many people take ginkgo supplements advertised to improve memory. In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatmentgroup took 40 mg of ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale wasadministered. Higher scores indicate better memory function. Summary values are below in the table.nGinkgo1045.70.6Placebo1155.50.5We are testing for evidence that taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale.Is this problem about means or proportions?Is this problem one sample or two sample?Set up the hypothesisHo-HạiFind the test statistic (round to decimal places)Test statisticFind the p-value (round to 4 decimal places)p-valueWhat is the degrees of freedom by calculator? (Round to the nearest whole number)What is the degrees of freedom by hand?Do we reject or fail to reject the null hypothesis?

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 11PPS

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Many people take ginkgo supplements advertised to improve memory. Are these over-the- counter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg of ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in the following table: Ginkgo 104 5.7 0.6 Placebo 115 5.5 0.5 Perform the appropriate test to determine if taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale. > Is the study observational or designed experiment? > Can you conclude association or causation with this type of study? > Is this a matched-pair dependent test or two-sample independent test? O Null hypothesis: OAlternative…
Many people take ginkgo supplements advertised to improve memory. Are these over-the- counter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg of ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in the following table: N x̄ s Ginkgo 104 5.7 0.6 Placebo 115 5.5 0.5 a) Based on these results, is there evidence that taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale? b) Write a brief report on your findings.
Many people take ginkgo supplements advertised to improve memory. Are these over-thecounter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg of ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in thefollowing table: N x sGinkgo 104 5.7 0.6Placebo 115 5.5 0.5a) Based on these results, is there evidence that taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale? b) Write a brief report on your findings
Many people take ginkgo supplements advertised to improve memory. Are these over-the- counter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg o ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in the following table: N Ginkgo 104 5.7 0.6 Placebo 115 5.5 0.5 Perform the appropriate test to determine if taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale. > Is the study observational or designed experiment? > Can you conclude association or causation with this type of study? Is this a matched-pair dependent test or two-sample independent test?
Researchers wanted to know the effectiveness of a new anti-venom shot. A study was conducted on 245 children who had nonlethal scorpion stings. The ages of the children ranged from 6 months to 18 years old. Each child was randomly assigned to receive a shot of the anti-venom or a placebo shot. Researchers recorded whether or not their condition improved over the next four hours. They found that about 73% of the children who were given anti-venom saw an improvement in their condition whereas only about 23% of the children who were given the placebo saw an improvement in their condition. Identify the population.The population is all children 6 months to 18 years old with nonlethal scorpion stings. Identify the sample.The sample is 245 children 6 months to 18 years old with nonlethal scorpion stings. What is the treatment variable? The treatment variable is the anti-venom shot. What is the response (or outcome) variable?The outcome variable is improvements in their condition.…
Ellen Davis Jones studied the effects of reminiscence therapy for older women with depression. She studied 15 women 60 years or older residing for 3 months or longer in an assisted living long-term care facility. For this study, depression was measured by the Geriatric Depression Scale (GDS). Higher scores indicate more severe depression symptoms. The participants received reminiscence therapy for long-term care, which uses family photographs, scrapbooks, and personal memorabilia to stimulate memory and conversation among group members. Pre-treatment and post-treatment depression scores are given in the following table. Can we conclude, based on these data, that subjects who participate in reminiscence therapy exercise, on average, a decline in GDS depression scores? Assume that alpha = 0.01. Pre-GDS 12 10 16 2 12 18 11 16 10 14 Post-GDS 11 10 11 3 9 13 8 14 10 12 What is the null and alternative hypothesis…
A group of disabled women ages 65 and older were followed for several years. It was found that those who had a vitamin B12 deficiency were twice as likely to suffer from severe depressions than those who did not.a. Describe the type of study being performed.b. Describe the explanatory variable(s) and response variable(s).
A research team wants to investigate the usefulness of relaxation training for reducing levels of anxiety in individuals experiencing stress. They identify 30 people at random from a group of 100 who have "high stress" jobs. The 30 people are divided into two groups. One group acts as the control group they receive no training. The second group of 15 receive the relaxation training. The subjects in each group are then given an anxiety inventory. The summarized results appear below where higher scores indicate greater anxiety. The raw data appear below. Evaluate her experiment using the criteria of p < 0.05. Assume it is a two tailed test. YSou need to perform the 5 steps in Hypothesis Testing. CONTROLLED RELAXED 38 40 35 36 35 32 31 30 28 26 24 21 35 32 30 34 30 32 28 27 22| 22 18 34 22 18 17 17 25 21
A research team wants to investigate the usefulness of relaxation training for reducing levels of anxiety in individuals experiencing stress. They identify 34 people at random from a group of 100 who have "high stress" jobs. The 34 people are randomly divided into two groups. One group acts as the control group and receive no training. The second group of 17 receive the relaxation training. The subjects in each group are then given an anxiety inventory. The summarized results appear below where higher scores indicate greater anxiety. Control Group: n = 17, mean = 31, standard deviation = 6.63Relaxation Group: n = 17, mean = 26, standard deviation = 6.20 A: What type of test should you conduct? One-sample t test, Independent 2-sample t test, Paired sample t test?B. Should you reject or retain the null hypothesis using an alpha level of 0.05 (two tailed test)?C: Construct a 68% confidence interval around the anticipated difference.D: Calculate a Cohen’s d effect size value.
A research team wants to investigate the usefulness of relaxation training for reducing levels of anxiety in individuals experiencing stress. They identify 34 people at random from a group of 100 who have "high stress" jobs. The 34 people are randomly divided into two groups. One group acts as the control group and receive no training. The second group of 17 receive the relaxation training. The subjects in each group are then given an anxiety inventory. The summarized results appear below where higher scores indicate greater anxiety.Control Group: n = 17, mean = 31, standard deviation = 6.63Relaxation Group: n = 17, mean = 26, standard deviation = 6.20
A researcher seeks to assess a new one-off therapy to see if it can stop children being afraid of monsters under their bed at night. The child participants are randomly allocated to one of two groups, where one group receives the new therapy, and the other group receives a placebo self-esteem therapy. Both groups are measured on the degree to which they feel afraid of monsters under their bed when they go to sleep for the next week (scale 1-10). What is the best description of the type of research and research design used? Experimental; Repeated measures Experimental; Independent groups Quasi experimental; Independent groups Observational; Correlational For the following statement, choose the most appropriate research design, and the appropriate levels of the IV, from the options below. Doctors respond faster to alarms that consist of both flashing lights and sounds than sounds alone. Most appropriate design: Quasi Experimental; Levels of I.V.: Light and Sound; Sound only Most…

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