Question

Based on this poll, find a 95% confidence interval to estimate the percentage of U.S. adults who feel that access to healthcare is the most urgent health problem facing this country. Interpret your interval in context.

Answer 1

Confidence Interval Meaning, Implication, Formula

Explanation:

95% confidence interval is the range around the stable estimate, which has 95% certainty (or probability) of containing true population parameter.

Formula : x' + z (s/ √n)

Where : x' = sample mean, confidence level value, s = standard deviation, sample size

By using sample size, sample mean, sample standard deviation of US people 'considering health care access most important' - & using above formula - range containing actual population proportion (with 95% sure probability) thinking the same.