answear - a) H0: p1 = p2 Ha: p1 > p2 b) Reject H0 if z...

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a) H 0 : p 1 = p 2 H a : p 1 > p 2 b) Reject H 0 if z > 2.326 c) 5 1 2 1 2 20 4 ˆ 8.322 10 153,348 135,035 X X p x n n - + + = = = + + ( ) ( ) 1 2 5 5 1 2 20 4 ˆ ˆ 153,348 135,035 2.961 1 1 1 1 8.322 10 1 8.322 10 ˆ ˆ 1 153,348 135,035 p p z x x p p n n - - - - = = = æ ö æ ö ÷ ÷ ç ç - + ÷ ÷ - + ç ç ÷ ÷ ÷ ç ç ÷ ç è ø è ø d) Since the test statistic is in the rejection region, we reject the null hypothesis. We have sufficient evidence to conclude that the yellow fire trucks significantly reduced the
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