# Answers to Homework 1 - 17 A I.V Supplements vs Placebo D.V...

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Answers to Homework 1 Problems #1, 10, 13, 14, 15, 17, 18, 20, 21, and 23 1. A) The population is adolescent boys. B) The sample is the 30 boys selected for the study. 10. Experiment. They manipulated the I.V. 13. Discrete Variable: consists of separate, indivisible categories. No values can exist between two neighboring categories. Continuous Variable: There are an infinite number of possible values that fall between any two observed values. 14. A) An ordinal scale provides information about the direction of difference (greater or less) B) An interval scale provides information about the magnitude or the difference between the two measurements C) A ratio scale provides information about the ratio of the two measurements 15. A) Humorous vs. Non-humorous sentences B) Nominal C) Number of sentences recalled D) Ratio
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Unformatted text preview: 17. A) I.V.: Supplements vs. Placebo D.V.: Performance on Motor Behavior Tasks (Time it takes to find the platform) B) Ratio 18. A) 6+1+3+4+2 = 16 B) 6 2 +1 2 +3 2 +4 2 +2 2 = 36 + 1 + 9 + 16 +4 = 66 C) (6+1+3+4+2) 2 = 16 2 = 256 D) (6-1)+(1-1)+(3-1)+(4-1)+(2-1) = 5+0+2+3+1 = 11 20. A) 5 + -1 + 0 + -3 + -1 = 0 B) 5 2 + -1 2 +0 2 + -3 2 + -1 2 = 25 +1 + 0 + 9 +1 =36 C) (5+3) + (-1+3) + (0+3) + (-3+3) +( -1+3) = 8 + 2 + 3 + 0 + 2 = 15 21. A) 3 + 5 + 0 + 8 + 6 = 22 B) 7 + 4 + 3 + 1 +5 = 20 C) (3*7) + (5*4) + (0*3) + (8*1) + (6*5) = 21 + 20 + 0 + 8 + 30 = 71 23. A) 4 2 +0 2 +0 2 +8 2 = 16 +0 + 0 + 64 = 80 B) (4+0+0+8) 2 = 12 2 = 144 C) (4-3) + (0-3) + (0-3) + (8-3) = 1 + -3 + -3 + 5 = 0 D) (4-3) 2 + (0-3) 2 + (0-3) 2 + (8-3) 2 = 1 2 + -3 2 + -3 2 + 5 2 = 1 + 9 + 9 + 25 = 44...
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