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In: Statistics and Probability

David E. Brown is an expert in wildlife conservation. In his book The Wolf in the...

David E. Brown is an expert in wildlife conservation. In his book The Wolf in the Southwest: The Making of an Endangered Species (University of Arizona Press), he records the following weights of adult grey wolves from two regions in Old Mexico.

Chihuahua region: x1 variable in pounds

86 75 91 70 79
80 68 71 74 64

Durango region: x2 variable in pounds

68 72 79 68 77 89 62 55 68
68 59 63 66 58 54 71 59 67

(a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Use 2 decimal places.)

x1
s1
x2
s2


(b) Let μ1 be the mean weight of the population of all grey wolves in the Chihuahua region. Let μ2 be the mean weight of the population of all grey wolves in the Durango region. Find a 90% confidence interval for μ1 – μ2. (Use 2 decimal places.)

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orchestra answered 2 years ago
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