Which of the three main types of studies is shown in each example below? Explain your reasoning. Study 1 A fund manager studies whether the values of her clients' investments increase, decrease, or stay the same based on applying her normal investment strategy or using a more aggressive strategy. Study 2 An investment company polls randomly selected business-school students about which industry they would most likely invest their money in. Study 3 A firm is considering a new website design. An intern determines how long each visitor stays on the site using the new design and then using the old design.