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Chap 28 Questions

# Chap 28 Questions - Chapter 28 1 Consider the outcome of...

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Chapter 28 1. Consider the outcome of 190 spins of a roulette wheel, shown in the table. As a null hypothesis, suppose the roulette wheel is balanced. Color Observed Frequency Red 84 Black 88 Green 18 a) What is the expected frequency for each color? b) Find the χ 2 –statistic for the observed values. c) How many degrees of freedom are there? d) Compute the P -value for the observed values. Is the wheel balanced? For Problem 2, consider a set of crossing experiments concerning pollen sterility in plants. Source: R. C. Jackson, N. Ngo and H. Ngo, “Chromosome-specific desynapsis in the n = 2 race of haplopappus gracilis (Compositae),” American Journal of Botany , Vol. 89, pp. 777-782 (2002). 2. A dihybrid cross produced 44 offspring. Of these, 31 were dominant for both traits, 5 were dominant for the first trait but not the second, 5 were dominant for the second trait but not the first, and 3 were recessive for both traits. Make a χ 2 –test and determine if these numbers are consistent with the expected 9:3:3:1 ratio.

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