D Question 4 4 pts The board of directors for a toothpaste company are concerned that only 20% of people who use toothpaste buy Gleam toothpaste. The marketing director suggests that the company invest in a new advertising campaign. The company runs some trials to see if the new advertising will increase the market share for Gleam. Based on the data they collected, they found a 95% confidence interval of (15%, 30%) for the market share. a) Interpret this interval in a sentence or two, using appropriate statistical terminology. b) Should the company invest in this advertising campaign? State "Yes" or "No" and justify your answer. 12pt Paragraph B I U A & T2v