Colored string preferred by chickens. Refer to the Applied Animal Behaviour Science (Octob...

Colored string preferred by chickens. Refer to the Applied Animal Behaviour Science (October 2000) study of domestic chickens exposed to a pecking stimulus, presented Recall that the average number of pecks a chicken takes at a white string over a specified time interval is known to be μ = 7.5 pecks. In an experiment in which 72 chickens were exposed to blue string, the average number of pecks was   pecks, with a standard deviation of s = 2.21 pecks.

a. On average, are chickens more apt to peck at white string than at blue string? Conduct the appropriate test of hypothesis, using α = .05.

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b. Compare your answer to part a with your answer to Exercise 5.21 b.

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c. Find the p -value for the test and interpret it

Colored string preferred by chickens. Animal behaviorists have discovered that the more domestic chickens peck at objects placed in their environment, the healthier the chickens seem to be. White string has been found to be a particularly attractive pecking stimulus. In one experiment, 72 chickens were exposed to a string stimulus. Instead of white string, blue string was used. The number of pecks each chicken took at the blue string over a specified interval of time was recorded. Summary statistics for the 72 chickens were  pecks and s = 2.21 pecks ( Applied Animal Behaviour Science , October 2000).

a. Use a 99% confidence interval to estimate the population mean number of pecks made by chickens pecking at blue string. Interpret the result.

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b. Previous research has shown that μ = 7.5 pecks if chickens are exposed to white string. Based on the results you found in part a , is there evidence that chickens are more apt to peck at white string than blue string? Explain.