(Solved): 2/  Two different types of injection-molding machines are used to form plastic parts. A part ...

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Two different types of injection-molding machines are used to form plastic parts. A part is considered defective if it has excessive shrinkage or is discolored. Two random samples, each of size 300 , are selected, and 16 defective parts are found in the sample from machine 1, while 9 defective parts are found in the sample from machine 2 . Is it reasonable to conclude that both machines produce the same proportion of defective parts? Use \( \alpha=0.05 \). (a) Test the hypothesis \( H_{0}: p_{1}=p_{2} \) verses \( H_{1}: p_{1} \neq p_{2} \). What is \( z_{0} \) ? Round your answer to two decimal places (e.g. 98.76). \[ z_{0}= \]