When the 2000 GSS asked subjects whether they would be willing to accept cuts in their standard of living to protect the environment, 344 of 1170 subjects said yes.

(b) What is the margin of error for this estimate? (Assume a 95% confidence level.)

(c) Find a 95% confidence interval for the population proportion.

(d) Which of the following assumptions are needed for the interval in (c) to be valid?

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