Difference between proportions of large gravel pieces

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1. In a certain state, a referendum is being held to determine whether the transportation authority should issue additional highway bonds. A sample of 500 voters is taken in county A, and 285 say that they favor the bond proposal. A sample of 600 voters is taken in county B, and 305 say that they favor the bond issue. Can you conclude that the proportion of voters favoring the proposal is greater in county A than in county B?

2. Out of 1200 pieces of gravel from one plant, 110 pieces are classified as "large." Out of 900 pieces from another plant, 95 are classified as large. Can you conclude that there is a difference between the proportions of large gravel pieces produced at the two plants?

Reference no: EM131009181

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