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 groupor control group. The 104 participants who were assigned to the treatment group took 40 mg oginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took aplacebo 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 given in thefollowing table:NGinkgo1045.70.6Placebo1155.50.5Perform the appropriate test to determine if taking 40mg of ginkgo 3 times a day is effective inincreasing 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?

Given: Ginkgo: n1=104x¯1=5.7s1=0.6 Placebo: n2=115x¯2=5.5s2=0.5The Study is Designed and we conclude causation with this type of study This is a two-sample independent test Since (s1/s2)>1 we can make a call about population variances and consider them to be equal. Conducting a right tailed test at α=0.05 H0: μ1=μ2H1: μ1>μ2sp2=(n1-1)×s12+(n2-1)×s22n1+n2-1=103×0.36+114×0.25217=0.3022T.S. =(x¯1-x¯2)-(μ1-μ2)sp1n1+1n2~tn1+n2-2=(5.7-5.5)-00.3022×1104+1115=0.07439Critical value =1.65191 Since, T.S. < Critical value, we do not have enough evidence to reject H0. Hence taking 40mg of gingko 3 times a day is not effective in increasing mean performance on the Wechsler Memory Scale.

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Statistics

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 grou or control group. The 104 participants who were assigned to the treatment group took 40 mg 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 wa administered. Higher scores indicate better memory function. Summary values are given in th 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?

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 grou or control group. The 104 participants who were assigned to the treatment group took 40 mg 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 wa administered. Higher scores indicate better memory function. Summary values are given in th 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?

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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