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Get Full Access to Stats Modeling The World - 4 Edition - Chapter 12 - Problem 22
Get Full Access to Stats Modeling The World - 4 Edition - Chapter 12 - Problem 22

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# Insomnia Exercise 10 describes an experiment showing that exercise helped people sleep ISBN: 9780321854018 481

## Solution for problem 22 Chapter 12

Stats Modeling the World | 4th Edition

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Problem 22

Insomnia Exercise 10 describes an experiment showing that exercise helped people sleep better. The experiment involved other groups of subjects who didnt exercise. Why didnt the experimenters just have everyone exercise and see if their ability to sleep improved?

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Assignment#4 Sana Nasim Problem#1 (a) The main effect of A: A=1/4n[a+ab+ac+abc-(1)-b-c-bc] A=1/3(8) [104+148+113+127-78-119-127-164] A= 4/12= 0.3333 The main effect of B: B=1/4n[b+ab+bc+abc-(1)-a-c-ac] B=1/4(3) [119+148+164+127-78-104-127-113] B=136/12= 11.333 The main effect of C: C=1/4n[c+ac+bc+abc-(1)-a-b-ab] C=1/4(3) [127+113+164+127-78-104-119-148] C= 82/12=6.8333 The interaction effect of AB: AB=1/4n[abc-bc+ab-b-ac+c-a+(1)] AB=1/4(3) [127-164+148-119-113+127-104+78] AB =-20/12 =-1.666 The interaction effect of AC: AC=1/4n[(1)-a+b-ab-c+ac-bc+abc] AC=1/4(3) [78-104+119-148-127+113-164+127] AC=-106/12=-8.8333 The interaction effect of BC: BC=1/4n[(1)+a-b-ab-c-ac+bc+abc] BC=1/4(3)[78+104-119-148

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##### ISBN: 9780321854018

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