78. The following sample data pertain to the shipments received by a large firm from three different vendors: Number Num

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78 The Following Sample Data Pertain To The Shipments Received By A Large Firm From Three Different Vendors Number Num 1 (58.68 KiB) Viewed 22 times

78. The following sample data pertain to the shipments received by a large firm from three different vendors: Number Number imperfect Number rejected but acceptable perfect Vendor A 12 23 89 Vendor B 8 12 62 Vendor C 21 30 119 Test at the 0.01 level of significance whether the three vendors ship products of equal quality. Tests of Hypothesis involving Means, Vari 85. The sheets ambient Condition (a) Verify that the mean and the standard deviation of this distribution are x=20 and s=5. (b) Find the probabilities that a random variable having a normal distribution with = 20 and o = 5 will take on a value less than 9.5, between 9.5 and 14.5, between 14.5 and 19.5, between 19.5 and 24.5, between 24.5 and 29.5. between 29.5 and 34.5, and greater than 34.5. (e) Find the expected normal curve frequencies for the various classes by multiplying the probabilities obtained in part (b) by the total frequency, and then test at the 0.05 level of significance whether the data may be looked upon as a random sample from a normal population. Condition Use as whether mean dry the 0.05 l