Colored string preferred by chickens. Animal behaviorists have discovered that the more do...

Colored string preferred by chickens. Animal behaviorists have discovered that the more domestic chickens

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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.