A random sample of 20 adult male wolves from the Canadian Northwest Territories gave an average weight x1 = 99 lb with estimated sample standard deviation s1 = 6.3 lb. Another sample of 22 adult male wolves from Alaska gave an average weight x2 = 91 lb with estimated sample standard deviation s2 = 7.1 lb
What is the value of the sample test statistic? Compute the corresponding z or t value as appropriate. (Test the difference μ1 - μ2. Round your answer to three decimal places.)