At a popular restaurant, where Chang is the head Chef, the following events occurred:

A. Chang determined that sales of the house salad had dropped.

B. Chang decided that the house salad needed a new dressing.

C. In a taste test, Chang prepared four bowls of lettuce, each with a new dressing: sesame seed, olive oil and balsamic vinegar, creamy Italian and blue cheese.

D. The tasters rated the sesame seed salad dressing as the favorite.

E. After two weeks, Chang noted that the orders for the house salad with the new sesame seed dressing had doubled.

F. Chang decided that the sesame seed salad dressing improved the sales of the house salad because the sesame seed dressing enhanced the taste. Identify each activity as an observation, hypothesis, an experiment, or a conclusion.