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Coursepack, p. 656 Math 133: 9.1 Worksheet #3 Name: Slack Section: 9.1: Estimating a Population Proportion 1. For each of the following, select the best answer and circle it. a. How many critical z-values must a confidence interval for population proportion have? Zero One Two b. Find the critical z-values corresponding to an 85% confidence level. +1.036 +1.4395 +0.1067 +1.5761 C. What are the critical z-values for a confidence interval if a = 0.14? +1.4758 +1.0803 10.1764 +1.8119 d. What confidence level would use the critical z-values from part c? 14% 72% 86% 93% 98.6% 2. In a recent survey, it was found that 60% of adult Americans believe abortion should either always be legal or legal most of time time, with a 3.1 percent margin of error. (Source) State the confidence interval 3. The Pew Research Center polled 1015 random adult Americans and found that 558 of them think "parents do too much for their young adult children". (Source) a. Find a point estimate for the proportion of all adult Americans who think parents do too much for their young adult children. (Give 2 decimal places) b. Construct a 90% confidence interval for the proportion of all adult Americans who think parents do too much for their young adult children. (Assume requirements to make intervall are met. Include formula, substitution, and result; Give 4 decimal places) c. Interpret the interval in the context of the situation