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t Question oursesapi a.com/at servet quiz?ctx-mlp est-0007&quiz; act onstakeQuiz&quiz; probGuid«QNAPCOA % There s sre eveer ndicat ng that people wth visible tattoos are verwed more negatively than people within visible tattoos. tResentoeft, A, Vila, .,a wiseman, D. (2006). Tattoos can harm peroeptions: A study and suggestions. Joumal of Americar College Heavth, 56, 593-596.1 un a smilar study, a researcher first obtains overal ratings of ettractiveness for a woman with no tattoos shown in a color photograph. On a 7-point scale, the woman receives an average rating of u- 4.9, and the distribution of ratings is normal wth a standard deviation of a-0.84. The researcher then modifes the photo by edcing a tattoo of a butterfly on the woman's left arm. The modifed photo is then showm to a sample of n 16 students at a local community colege, and the students use the same 7-point sxcale to rate the ettractiveness of the worman. The average score for the photo with the tattoo is M-4.2 do the data indicate a significant difference in rated attractiveness when the woman appeared to have a tattoo? use a two-tailed test with -.os. Standard Normal Distribution Standand Deviation-1.0 -3.0 2.0 1.0 2.0 3.0 0.00 with z there a significant difference compute Cohen's d to measure the size of the effect. Round to three decimal places Complete the sentence describing the outcome of the hypothesis test and the measure of effect size as it would appear in a research report: The results attractiveness of a woman that the presence of a tattoo a significant effect on the judged andExplanation / Answer
Z= mean-mu/sigma/sqrt(n)
= 4.2-4.9/0.84/sqrt(16)
= -0.7/0.84/4
z= -3.33
Since it is two tailed test , we will take absolute value of Z
Z= 3.33
critical value of z at alpha= 0.05 is 1.96 for two tailed test
There is a significant difference.
Cohen's d = (4.2 - 4.9) 0.84 = 0.833
The results have sufficient evidence that thepresence ofa tatoo has a significant effect on the judgedattractiveness ofa woman: Z= 3.33, The P-Value is 0.000868. The result is significant at p < 0.05.and cohens d is 0.833 which is large.
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