A determine the proportion of instances that the duration, Ask an Expert

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a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent.

(hint: proportion is number of successes divided by total number.)

b) Calculate the 95% confidence interval of the proportion. What is the margin of error?

c) Calculate the 90% confidence interval of the proportion.

d) For a 95% confidence level and a margin of error of 3% (0.03), how many samples are needed?

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