Confidence Interval for Population Proportion

Calculate a confidence interval for a population proportion.

From his purchased bags, Randy counted 120 red candies out of 500 total candies.

Using a 90% confidence interval for the population proportion, what are the lower and upper limits of the interval? Answer choices are rounded to the thousandths place.

• a.)
• Lower Limit: 0.215
• Upper Limit: 0.271
• b.)
• Lower Limit: 0.209
• Upper Limit: 0.265
• c.)
• Lower Limit: 0.215
• Upper Limit: 0.265
• d.)
• Lower Limit: 0.209
• Upper Limit 0.271