the 24. A researcher develops an advertisement aimed at increasing how much the
ID: 3361303 • Letter: T
Question
the 24. A researcher develops an advertisement aimed at increasing how much the public trusts a fed- eral organization. She asks participants to rate their level of trust for the organization before and after viewing an advertisement. Higher rat- ings indicate greater trust. From the following findings reported in APA format, interpret these results by stating the research design used (repeated-measures or matched-pairs), the sam- to gs nt. b- ne d- ple size, the decision, and the effect size. ic Participants rated the federal organiza- tion as significantly more trustworthy (Mp +4 points) after viewing the adver- tisement, t(119) = 4.021, pExplanation / Answer
This is a repeated measures design , where measurements were taken on the same variable twice . Here the variable of interest is ratings of the level of trust of an organization . This ratings were taken twice , one before an advertisement and one after the advertisement . Here the size of the sample is 120 . Now , since the p-value is less than 0.05 , hence we reject the null hypothesis . Thus we accept the fact that advertisement increases the faith of public in federal organization . Here the effect size is 0.88 which is quite large thus validating the result of the hypothesis testing .
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