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eText Book Here! 20 × M8 Assignment Tet Book Here! 20 × ©Chegg Study! Guid × 90 confidence inter × -Untitled document × ©EText Book Here! 20 × + wwwwebassign.net/web/Student/Assignm ent bmit?d 90% … |Q.Search 43. -17 points BBUnderStat12 7.4.025 Female undergraduates in randomized groups of 23 took part in a self-esteem study. The study measured an index of self-esteem from the point of view of competence, social acceptance, and physical attractiveness. Let xi, x2, and x be random variables representing the measure of self-esteem through x1 (competence), x2 (social acceptance), and x3 (attractiveness). Higher index values mean a more positive influence on self-esteem. My Note8 + Ask Your able dard Deviation s Size Mean x 23 23 23 xz x3 19.41 19.34 3.27 3.49 4.02 (a) Find a 90% confidence interval for 1-2-(Round your answers to two decimal places.) lower limit upper limit (b) Find a 90% confidence interval for 1-Kg. (Round your answers to two decimal places.) lower limit upper limit (c) Find a 90% confidence interval for 2-13, (Round your answers to two decimal places.) lower limit upper limit (d) Comment on the meaning of each of the confidence intervals found in parts (a), (b), and (c). At the 90% confidence level, what can you say about the average differences in influence on self-esteem between competence and social acceptance? between competence and attractiveness? between social acceptance and attractiveness? This answer has not been graded yet 4:32 PM O Type here to search 11/20/2017Explanation / Answer
a)
b)
c)
d) As for all the CIs we see there is 0 included in it, this means there are evidence at 90% CI that there is no difference in the self esteem.
x1bar 19.41 x2bar 19.34 n1 23 n2 23 s1 3.27 s2 3.49 mu1 - mu2 0.07 DF = n1 + n2 - 2 44 SE = sqrt(s1^2/n1 + s2^2/n2) 1.00 t-value for 90% CI and DF = 44 1.68 ME = t*SE 1.68 lower limit = (x1bar - x2bar) - ME -1.61 Upper limit = (x1bar - x2bar) + ME 1.75Related Questions
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