1. Emily is interested in whether listening to jazz music can boost attention in older adults. Specifically, she wants to know whether older adults perform differently on an attention task when they listen to jazz music compared to when they sit in silence. She collects a random sample of 80 older adult participants to conduct her study. Half of the participants complete the attention task while listening to jazz music on headphones, while the other half completes the attention task in silence. (5 pts total)

A) What type of research design is this? How do you know? (1 pt)

B) Describe one limitation that Emily should consider about her design. Describe what she could do to best address this limitation in her study. (2 pts)

C) Emily finds that her sample of older adults who listened to jazz music performed on the attention task with a M = 80 and s 2 = 0.0015, while her sample of older adults who completed the attention task in silence had a M = 72 and a s 2 = 16. Given this information, are there any assumptions that her data likely violates? If yes, how do you know? What issue might this pose when calculating her test statistic and why? (You do NOT need to perform any calculations for this question). (2 pts)