In a study to test whether or not there is a difference between the average heights of adult females in two different countries, random samples of size n1 = 120 and n2 = 150 yielded x , = 62. 7 inches and x , = 61. 8 inches. Extensive studies of a similar kind have shown that it is reasonable to let ơ1 = 2. 5 inches and o1 = 2. 62 inches. Test at the 0.05 level of significance whether the difference between these two sample means is significant. 1 Instructions: Assume 8 = 0, in addressing the problem obtain the value of the test statistic and its corresponding p – value up to four decimal places. 23D — 2.8772; р — value = 0. 9979 О2 3D 2. 8772;B р— value — 0. 9980 О2%3D 2.8772; р— value = 0. 0020 Ох— 2.8772; р — value = 0.0040

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