How do price changes affect equilibrium? a. by assisting centrally planned economy b. by serving as a tool for distributing goods and services c. by limiting the market to people who have the most d. by preventing inflation or deflation from affecting the supply of goods

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.