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Solved: It is known that roughly 2/3 of all human beings
Chapter 8, Problem 46E(choose chapter or problem)
Problem 46E
It is known that roughly 2/3 of all human beings have a dominant right foot or eye. Is there also right-sided dominance in kissing behavior? The article “Human Behavior: Adult Persistence of Head-Turning Asymmetry” (Nature, 2003: 771) reported that in a random sample of 124 kissing couples, both people in 80 of the couples tended to lean more to the right than to the left.
a. If 2/3 of all kissing couples exhibit this right-leaning behavior, what is the probability that the number in a sample of 124 who do so differs from the expected value by at least as much as what was actually observed?
b. Does the result of the experiment suggest that the 2/3 figure is implausible for kissing behavior? State and test the appropriate hypotheses.
Questions & Answers
QUESTION:
Problem 46E
It is known that roughly 2/3 of all human beings have a dominant right foot or eye. Is there also right-sided dominance in kissing behavior? The article “Human Behavior: Adult Persistence of Head-Turning Asymmetry” (Nature, 2003: 771) reported that in a random sample of 124 kissing couples, both people in 80 of the couples tended to lean more to the right than to the left.
a. If 2/3 of all kissing couples exhibit this right-leaning behavior, what is the probability that the number in a sample of 124 who do so differs from the expected value by at least as much as what was actually observed?
b. Does the result of the experiment suggest that the 2/3 figure is implausible for kissing behavior? State and test the appropriate hypotheses.
ANSWER:
a. The probability that the number of couples in a sample of 124 who exhibit right-leaning behavior differs from the expected value by at least as much as what was observed is 0.0985.
b. The null hyp