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Mathematics, 21.06.2019 17:00
Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90Ā° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, ā6) is rotated 90Ā° counterclockwise. (x, y) ā (āy, x) 1. switch the x- and y-coordinates: (6, ā3) 2. multiply the new x-coordinate by ā1: (6(ā1), ā3) 3. simplify: (ā6, ā3) .
Answers: 1
Mathematics, 21.06.2019 20:50
An automobile assembly line operation has a scheduled mean completion time, Ī¼, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.
Answers: 3
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