Approximately 91% of all adults in South Korea have a cell phone. In a simple random sample of 200 adults in the United States, 171 owned cell phones.
Is there convincing evidence to suggest the proportion of adults who own cell phones in the U.S. is lower than the proportion of adults who own cell phones in South Korea?
Use your formula chart from Chapter 7, calculate a 95% confidence interval for the true proportion of adults who own cell phones in the US.
The 95% Confidence Interval: _______ to _______
Round each number to four places past the decimal.