What factor or factors can cause a difference between your observed results and expected results?

Were the deviations (differences between observed and expected) the result of chance, or were they due to other factors. ... The chi-square test is always testing what scientists call the null hypothesis, which states that there is no significant difference between the expected and observed result.

Explanation:

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carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.