Mathematics, 21.07.2020 20:01 glass60

A new purification unit is installed in a chemical process. Before its installation, a random sample yielded the following data about the percentage of impurity: x1 = 9.85, s21 = 6.79 and n1 = 10. After installation, a random sample resulted in x2 = 8.08, s2 = 6.18, and n2 = 8. A) Can you conclude that the two variances are equal?
B) Can you conclude that the new purification device has reduced the mean
percentage of impurity?

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A new purification unit is installed in a chemical process. Before its installation, a random sample...