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The extent of the interval on either side of the observed statistic (in this case p-hat) Confidence Interval. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. z= (p ̂_1- p ̂_2)/ (SE_pooled (p ̂_1- p ̂_2)) To the standard Normal model. The formula is x^2= sum of (observed-expected)^2/expected. qhnnnjberftumpvgjfhj