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(2018) 23 : Where: n is the required sample size, Z is the standard normal deviation corresponding to the confidence level (1.96 for 95% confidence), p is the estimated proportion of cigarette butt pollution from preliminary studies (assumed as 0.5 for maximum variability and 0.1 for minimum variability)

In China, a 10 percent higher price would reduce consumption by 5 percent and raise enough excise revenue to pay for a basic health package for 33 million poor rural Chinese

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