We compute z = 3100/(211 , 250)1/2 = 3100/459.62 - 6.74. Since 6.74 2 1.96, reject H and conclude that the two brands differ with respect to true average tread lives. (2J The test statistic value is z - (x - y - 1 0, 000) /(s2/m + s2./n)1/2, 7 and Hanbsp;...

Title | : | Solutions Manual for Probability and Statistics for Engineering and the Sciences, Second Edition |

Author | : | Jay L DeVore |

Publisher | : | Thomson - 1987 |

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