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3 4 5 6 below A researcher wishes to estimate the proportion of X-ray machines that malfunction. A random sample of 275 machi
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n = 975, X-71,6951 = 0.258187 Critical value, dal-0.95= 0.05 9/2 = 0.025 Za12= 20.025 = + (1.960 (using z fable] 95 - Confide

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