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When selecting a research hypothesis, researchers can have either a alternative or null research hypothesis.
In Science, a hypothesis is primarily considered to be a tentative or an educated guess and it can be defined as a testable explanation for an observation or a specific experimentation (research) problem, especially by using the "if . . . then . . . because" format..
A null hypothesis (H₀) can be defined the opposite of an alternate hypothesis (Ha) and it asserts that two (2) possibilities are the same.
In this context, we can reasonably and logically deduce that researchers can have either a alternative or null research hypothesis when selecting a research hypothesis.
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Complete Question:
When selecting a research hypothesis, researchers can have either a _____________ or _____________ research hypothesis.
a. valid, reliable
b. nondirectional, directional
c. mutually exclusive, exhaustive
d. alternative, null