Crab spiders hiding on flowers. Refer to the Behavioral Ecology (Jan. 2005) field study on the natural camouflage of crab spiders, presented in Exercise. Ecologists collected a sample of 10 adult female crab spiders, each sitting on the yellow central part of a daisy, and measured the chromatic contrast between each spider and the flower. The contrast values for the 10 crab spiders are reproduced in the table and saved in the SPIDER file. ( Note : The lower the contrast, the more difficult it is for predators to see the crab spider on the flower.) Recall that a contrast of 70 or greater allows bird predators to see the spider. Consider a test to determine whether the population median chromatic contrast of spiders on flowers is less than 70.
57 | 75 | 116 | 37 | 96 | 61 | 56 | 2 | 43 | 32 |
a. State the null and alternative hypotheses for the test of interest.
b. Calculate the value of the test statistic.
c. Find the p -value for the test.
d. At α =.10, what is the appropriate conclusion? State your answer in the words of the problem.
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