Imagine you put the $300 in a savings account earning 3.0% APR instead of using it to pay down your credit card as in Problem 3. What is the difference between the interest your
savings account would earn that month vs. the interest that would accrue on your credit card
that month if you didn't use the $300 to pay it down?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.