Suppose you’re working for Gallup Canada on a survey to estimate how many people believe that Canada should increase the amount of electric power generated by nuclear power stations. You conduct an initial survey of 250 adults, and 12.7% state that they support an increase in nuclear power. Your boss asks how accurate this estimate is, and goes on to say that the 95% confidence interval shouldn’t be spread more than 10% either side of the mean. To ensure a narrow enough spread, you get funding to increase your sample from 250 people, and get the figures in the following table:

Write a brief report presenting your results graphically, with recommendations for the next step in this project.

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Sample Size 500 1000 250 750 Proportion supporting nuclear power 0.127 0.149 0.134 0.131