Happiness could be anything. It could be the every day things you do that makes you grateful. It could be the fact the you have shelter over your head when you go home or the shoes you have on. Happiness is how you feel towards something and how it makes you feel.
Answer:
Sampling error
Explanation:
This is probably due to sampling error. The sampling error has the likelihood of occuring when the statistician fails to select a sample that could be a representation of the full population. The sample results are not a true representation of the true results from the entire population.
the null hypothesis tells us that no significant difference exists between the populations chosen, and any difference can be as a result of sampling error.
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In an experiment testing the effects of a treatment, a comparison grouprefers to a group of units (e.g., persons, classrooms) that receive either no TREATMENT or an alternative treatment.