In a ztudy of parents who have children with attention-deficithyperactivity diso

Question

In a ztudy of parents who have children with attention-deficithyperactivity disorder (ADHD). parents werc asked to ratc their overall stress level using the Porental Stress Scale (rss). This scalc has 18 items that contain statements regarding both pcsitive and negative aspects of parenthood. Respondents are asked to rate their agreement with each statement using a 5-point scale (-strongly disagree to 5-strongly agree. The scores are summed such that a higher score indicates greater stress. The mean rating tor the 50 parents in the study was reported as 52.92 with a starndard deviation of 10.38 a) Do you think that these dela are epprximelely normally distributed? Explain why or why not. his arewer haa not bean graded yet (b) Is it appropriate to use the methods of tis section to compute a g0% confidence interval? Explain why ar why not. No, the sample size is lass than 10o, so the mcthods of the scction ara not valid. O No, the standard deviation is too large compared to the mean, so the methods of the section are not valid ONo, the standard daviation is too small, so tha methods of the section ara not valid Yes, the sample size is 50, su Lhe methods of the sectiun should be valid. . No, t, sample sl7e ls greater than 30, so the mathons of tha sertian are nnt valid. c) Find the 00% margin oferror. (Round your answer to three decimal places. Find the corresponding confidence interval. (Round your answers to threc decimal places.) sentence explaining tha interval and the meaning of the 90ss confidence level. we are 10% confident that the papulation mean rating falls in this interval. we dre 90% curfident thal ure population mean rating falls in this interval. There is a gORh probability that the maan rating falls insida this interval. There is a 10% probability that the mean rating falls above this interval. The population maan rating talls in this interval 0% of the time. Write o (d) Ta recruit parents for the study, tha rasearchars visited a psychiatric outpatiant servica in Rohtak, India, and selactad 5D consecutia familias wha met tha inclusion and axdlusion criteria. To what cxtant do you think the rasults can he ganaralizad to all parants with child en who have ADID in India or in other locations around the world?

Explanation / Answer

A) yes it is normally distributed.Because the sample size is large.

B) option-E is the correct answer.

C) At 90% cinfidence interval the critical value = 1.645

Margin of error = 1.645 * SD/sqrt (n)

= 1.645 * 10.38/sqrt(50)

= 2.41

Cinfidence interval = mean +/- margin of error

= 52.92 +/- 2.41

= 50.51, 55.33

Option-B is the correct answer.

D)

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