In a survery of 389 households, a Food Marketing Institute found that 172 households spend more than $125 a week on groceries. To find the 80% confidence interval for the true proportion of the households that spend more than $125 a week on groceries, you need to use which one of the following calculators? Two Dependent Sample Means Comparison Given Data O Chi-Square Test for Goodness of Fit O One-Way ANOVA O Confidence Interval for a Population Mean Given Statistics O Two Independent Proportions Comparison O Chi-Square Test for Independence O Confidence Interval for a Population Mean Given Data O Two Independent Sample Means Comparison Given Data O Hypothesis Test for a Population Mean Given Data O Hypothesis Test for a Population Mean Given Statistics O Hypothesis Test for a Population Proportion Two Independent Sample Means Comparison Given Statistics Confidence Interval for a Population Proportion a. Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places. Confidence interval = b. Express the same answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places, c. Express the same answer using the point estimate and margin of error. Give your answers as decimals, to three places