Which factors determine dual-task performance in divided attention? Task Similarity, Practice, Task Difficulty Practice, Patience, Task Difficulty Task Difficulty, Sensory Processing, Perceptual Set Practice, Task Similarity, Automatic Processing
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Adi S.
Influencing performance in a serial addition task. A classic psychological test involves adding a set of numbers (e.g. $1,000+40+1,000+30+1,000+20+1,000+10)$ to evaluate cognitive behavior. In a study published in Advances in Cognitive Psychology (Jan. 2013), undergraduate students were all given the serial addition task, with the numbers presented on a computer screen. One group $\left(n_{1}=60\right.$ students) saw each of the numbers for 2 seconds on the screen. A second group $\left(n_{2}=60\right.$ students ) saw all the numbers on the screen at the same time, with the number 1,000 presented in bright red. The correct answer, of course, is 4,100 . In the first group, 17 answered correctly; in the second group, 12 answered correctly. a. Compute the proportion of students in Group 1 that answered correctly. b. Compute the proportion of students in Group 2 that answered correctly. c. Why is a statistical test of hypothesis (or confidence interval) required to compare the sample proportions, parts a and $\mathbf{b}$ ? d. Conduct a test ( at $\alpha=.01$ ) to compare the proportions. What inference can the researchers make regarding the two serial addition tasks?
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