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Question 3 --/1 View Policies Current Attempt in Progress How Much More Effective Is It to Test Yourself in Studying? We have

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the proportion of items correctly recalled \hat{p_{1}} = 0.15

the proportion of items reading study group \hat{p_{2}} = 0.42

standard error (SE)=0.07

z at 90 % confidence is 1.645

confidence interval =pi - p2 2* SE

= (0.15-0.42)\pm 1.645*0.07

= -0.27\pm0.12

= (-0.39,-0.15)

the 90 % confidence interval is -0.39 to-0.15

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