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Mathematics, 05.05.2020 10:53 natashareeves16
Tensile-strength tests were carried out on two different grades of wire rod. Grade 1 has 10 observations yielding a sample mean of 1085 and a standard deviation of 52. Grade 2 has 15 observations yielding a sample mean of 1034 and a standard deviation of 61. Assume the populations to be approximately normal with equal variances. State and conclude your hypothesis at the 0.05 level of significance if grade 1 and grade 2 true means are equal to each other.
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