Formally we do not reject the null hypothesis.
Formally we reject the null hypothesis.
Different fields tend to have different styles of documentation, that is, the way you cite a source and the way you represent the source in the References. For example, biologists use the documentation style of the Council of Biological Editors, and chemists use the style of the American Chemical Society. If you don't know what style you are expected to use in your reports (it's often given in the lab manual, check with your lab instructor. For further help you can check LabWrite Resources, "Citations and References."
There are four steps involved in hypothesis testing:
If you think you need to do more to convince your reader that you have learned what you say you have learned, provide more details in the Conclusion. For example, compare what you know now with what you knew before doing the lab. Describe specific parts of the procedure or data that contributed to your learning. Discuss how you may be able to apply what you have learned in the lab to other situations in the future.
failing to reject the null hypothesis when it is false.
The experimental results don't look different than we expect according to the null hypothesis, but they are, perhaps because the effect isn't very big.
failing to reject the null hypothesis when it is true.
1-state what the lab is about, that is, what scientific concept (theory, principle, procedure, etc.) you are supposed to be learning about by doing the lab. You should do this briefly, in a sentence or two. If you are having trouble writing the opening sentence of the report, you can try something like: "This laboratory experiment focuses on X…"; "This lab is designed to help students learn about, observe, or investigate, X…." Or begin with a definition of the scientific concept: "X is a theory that…."
rejecting the null hypothesis when it is true.
2. give the necessary background for the scientific concept by telling what you know about it (the main references you can use are the lab manual, the textbook, lecture notes, and other sources recommended by the lab manual or lab instructor; in more advanced labs you may also be expected to cite the findings of previous scientific studies related to the lab). In relatively simple labs you can do this in a paragraph following the initial statement of the scientific concept of the lab. But in more complex labs, the background may require more paragraphs.