Iii Question 13 Of 20 1 Point Question Attempt 1 Of 1 Espanol An Undergraduate Student Won An Award For His Study Of 1 (42.33 KiB) Viewed 22 times
Iii Question 13 Of 20 1 Point Question Attempt 1 Of 1 Espanol An Undergraduate Student Won An Award For His Study Of 2 (28.96 KiB) Viewed 22 times
Iii Question 13 Of 20 1 Point Question Attempt 1 Of 1 Espanol An Undergraduate Student Won An Award For His Study Of 3 (27.67 KiB) Viewed 22 times
III Question 13 of 20 (1 point) Question Attempt: 1 of 1 Español An undergraduate student won an award for his study of students diagnosed with ADHD (Attention Deficit Hyperactivity Disorder). He showed that students with ADHD performed significantly differently on a visual search task than did students who didn't have ADHD. The display he used for his search task contained letters positioned in various locations and orientations on a computer screen. The letters and their positions varied from trial to trial. The task of the participant on each trial was to determine, within two seconds, whether or not a particular "target" letter appeared among the letters. Each trial resulted in either a "hit" (the target appeared and the participant identified it in time), a "miss" (the target appeared and the participant did not identify it in time), a "false alarm (there was no target but the participant stated there was one), or a "correct rejection (there was no target and the participant stated this fact correctly) While attempting to get his study published in an a academic journal, the student was confronted with the following criticism: since he had used colored letters and backgrounds in his displays, couldn't the presence or absence of color vision in the participants have produced some of the effects seen in the data? The student went back, tested his participants for colorblindness, and reanalyzed the data. He considered the variables color vision of participant ("colorblind" or "not colorblind") and trial outcome ("hit", "miss", "false alarm", or "correct rejection"). The contingency table below gives a summary of the data from 2000 trials of the experiment. Each of the trials was performed ether by a colorblind participant or a non-colorblind participant. Each cell of the table contains three numbers: the first number is the observed cell frequency (o): the second number is the expected cell frequency (₂) under the assumption that there is no dependence between the two variables color vision of participant and trial outcomel and the third number is the following value. Vo-f) (observed cell frequency-Expected cell frequency) fz Expected cell frequency The numbers labeled "Total" are totals for observed frequency Part 1 valors m F in the mison wies in the continency table Round wour expected freuencies town or more decimal naces and met r Continue 60's Clouds no249 PType here to search 16 fi DEB E
FB Vo JR) Fill in the missing values in the contingency table. Round your expected frequencies to two or more decimal places, and round your three or more decimal places. J Send data to Excel Trial outcome Hit False alarm Correct rejection Total 85 26 68 0 30.91 68.95 204 0.780 0.013 Color vision 608 of 636 participant 272.09 607.05 1796 0 03089 0.001 303 676 2000 721 Part 2 Continue PType here to search Colorblind Not colorblind Total Miss 25 0 275 0 300 G 60 lety values to Expand B
ST Answer the following to summarize the test of the hypotheses that there is no dependence between the two variables color vision of participant and trial outcome. For your test, use the 0.05 level of significance. (a) Determine the type of test statistic to use. X S ? Type of test statistic: (Choose dhe) (b) Find the value of the test statistic. (Round to two or more decimal places.) 0 (c) Find the p-value. (Round to three or more decimal places.) 0 (d) Can we reject the hypothesis that there is no dependence between the variables color vision of participant and tra outcome? Use the 0.05 level of significance. ves No Continue PType here to search O 409 ClausyOONAN O 222
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