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5. In a Douglas-fir plantation, 80 of 120 randomly selected seedlings survived one year after planting....

5. In a Douglas-fir plantation, 80 of 120 randomly selected seedlings survived one year after planting. a. Find the 90% confidence interval for the unknown population proportion of survival. b. Find the 95% confidence interval for the unknown population proportion of survival. c. Compare your results from (a) and (b). Which interval is larger and why? d. Find the sample size needed if we want to be 95% confident that the sample proportion will be within 0.04 of the real proportion.

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