The slope of the trend line is 15. what does that mean in regard to the data of the scatterplot? check all that apply. the slope represents the rate of change of the data. advertising costs increase $15,000 as sales increase by $1,000. sales increase $15,000 as ads increase by $1,000. a positive slope infers a negative correlation. a positive slope infers a positive correlation.'

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.