question archive A researcher studied the weight of two species of rats: brown rats, and gray rats
A researcher studied the weight of two species of rats: brown rats, and gray rats
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A researcher studied the weight of two species of rats: brown rats, and gray rats. Samples from both species yielded the
following information: (the weight is in grams).
• Mean Standard Deviation
Brown Rats 25.2 3.5
Gray Rats 34.8 7.0
(a) What weight of a gray rat would make it comparable to a brown rat that weighs 21 grams? (hint: compare z-scores)
(b) If a brown rat weighs 32.9 grams, would you classify it as an outlying observation? (Justify your answer).
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