On a freeway 85% of vehicles violate the speed limit (π = 0.85). From the population of all vehicles on the freeway, you clock repeated random samples of size 400 vehicle.   31 To build a middle interval around the population proportion π such that 95% of all sample proportions deviate from the population proportion by no more than ±0.02 (2 percentage points), what is the minimum sample size to yield this interval?                 a 1225

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