The alternative hypotheses that make a hypothesis test one-tailed are 1. Parameter is less than a value and 2. Parameter is greater than a value.
An explanation for a phenomena or a forecast of the results of an experiment are both examples of hypotheses. It is a speculative claim about how two or more variables are related, and it can be verified via more investigation, testing, and data gathering. Usually based on existing information and observations, hypotheses can be confirmed or refuted via scientific investigation.
A hypothesis is created by making an educated guess or prediction about how an experiment will turn out based on prior knowledge and observations. This hypothesis provides the basis for further research, and it may be improved upon and put to the test by gathering more information.
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