Suppose the linear regression line y+2.1x+130 predicts sales based on the money spent on advertising. if x represents the dollars spent in advertising, and y represents the company sales in dollars, about how much can the company expect in sales if it spends $150 in advertising?

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.