To study their research question, researchers used a sample of N = 90 adults. After a stress-inducing activity, the sample interacted with a dog for a short period of time. Then, the sample completed the State/Trait Anxiety Inventory (STAI) and had M = 48. For the general population of adults who did not interact with a dog, scores on the STAl form a normal distribution with u = 52, o = 15. On the STAl, the higher the score, the more anxiety an individual has. Assuming a two-tailed test, state the NULL hypothesis (Ho) in a sentence AND in statistical notation