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QUESTION 13 (MRH_CH05-322B) You want to test the proportion of defectives in samples from two suppliers. Supplier A has sent

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Given that the supplier 1 has sent n1= 310 samples and out of which X1 = 27 are defective and supplier 2 has sent n2 = 20 samples and out of which x2 = 17 are defective hence the test statistic is calculated as:

2= P1-P2 VÕ(1-7)(1/nı +1/n2)

where the sample proportions are calculated as:

P = = 0 = 27 = 0.0871

pe = = 17 280 =0.0607

and the pooled proportion as:

p= X: +X Ni+N2 = 27-17 310-280 = 0.0746

Now the test statistic is calculated as:

0.0871-0.0607 (0.0746.1-0.0746)(1/310+1/280)

= 1.2187

Zo = 1.2187

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