The scientific method is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed scientific, a method of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.
Qualitative observation: Using your senses to observe the results. Quantitative observation: Are made using instruments. Such as rulers, balances, graduated cylinders, beakers, and thermometers. These results are measurable (numbers).
What is an inference? An inference is an implied meaning that is not directly stated but can be deduced from clues. Inferences require linking old knowledge to what is being read at the time.
What is an observation? When you observe, you become aware of something using one of your senses. Your five senses are smell, taste, sight, touch, and sound. In an observation you simply describe something as it appears. An observation is a statement describing a fact.