At a popular restaurant, where Lee is the head chef; the following events occurred: Lee determined that sales of the house salad had dropped.
Lee decided that the house salad needed a new dressing.
In a taste test, Lee prepared four bowls of lettuce, each with a new dressing:
sesame seed, olive oil and balsamic vinegar, creamy Italian, and blue cheese.
Tasters rated the sesame seed salad dressing as the favorite. After two weeks, Lee noted that the orders for the house salad with the new sesame seed dressing had doubled.
Lee decided that the sesame seed dressing improved the sales of the house salad because the sesame seed dressing enhanced the taste.

Lee determined that sales of the house salad had dropped.  Observation.

Lee decided that the house salad needed a new dressing.  Hypothesis.

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

Tasters rated the sesame seed salad dressing as the favorite. Observation.

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

Lee decided that the sesame seed dressing improved the sales of the house salad because the sesame seed dressing enhanced the taste. Conclusion.

Explanation:

In the given passage, the sentences all have different aspects of which it could be an observation, a hypothesis, or an experiment. A hypothesis is the decision to start or do a 'test', to try to come to a new process, or try to find a solution to the problem. An experiment is where 'tests' are done, to see which is the best. Observation is where the 'test' is observed and which is the possible outcome.

The different steps or aspects are listed as follows-

Lee determined that sales of the house salad had dropped. Observation.

Lee decided that the house salad needed a new dressing. Hypothesis.

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

Tasters rated the sesame seed salad dressing as the favorite. Observation.

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

Lee decided that the sesame seed dressing improved the sales of the house salad because the sesame seed dressing enhanced the taste. Conclusion.

the grass-plot before the jail, in prison lane, on a certain summer morning, not less than two centuries ago, was occupied by a pretty large number of the inhabitants of boston; all with their eyes intently fastened on the iron-clamped oaken door.

— the scarlet letter,

nathaniel hawthorne

''eyes intently fastened''

''iron-clamped oaken door''

are the answers