Updated: Mar 27
What is the Hypothesis? Definition of Hypothesis. Example of Hypothesis: The hypothesis usually involves proposing a possible relationship between two variables. 1. the independent variable (what the researcher changes) and 2. the dependent variable (what the researcher measure).
In research, there is a convention that the hypothesis is written in two forms: 1. Null hypothesis and 2. the alternative hypothesis. The alternative hypothesis is also called the experimental hypothesis when the method of investigation is an experiment.
Definition of Hypothesis:
"A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation." This means a hypothesis is a stepping stone to a soon-to-be proven theory. For a hypothesis to be considered a scientific hypothesis, it must be proven through the scientific method.
Type of Hypothesis:
Simple Hypothesis: The simple hypothesis is a prediction of the relationship between two variables. 1. The independent variables and 2. dependent variables. Example: Drinking sugary drinks daily leads to obesity.
Complex Hypothesis: The complex hypothesis examines the relationship between two or more independent variables and two or more dependent variables. Example: Overweight adults who value longevity and seek happiness are more likely than other adults to loos their excess weight and feel a more regular sense of joy.
Null Hypothesis: The null hypothesis is denoted as H0. Null Hypothesis exists when a researcher believes there is no relationship between the two variables, or there is a lack of information to state a scientific hypothesis. This is something to attempt to disprove or discredit. For example: there is no significant change in my health during the times when I drink green tea only or root beer only.
This is where the alternative hypothesis (H1) comes in to picture. In an attempt to disprove a null hypothesis, researchers will seek to discover an alternative hypothesis. Example: My health improves during the times when I drink green tea only, as opposed to root beer only.
The logical Hypothesis: The logical hypothesis is a proposed explanation possessing limited evidence. Generally, you want to turn a logical hypothesis into an empirical hypothesis.
An empirical hypothesis: An empirical hypothesis or working hypothesis, comes to life when a theory is being put to the test, using observation and experiment. It's no longer just an idea or notion. It's actually going through some trial and error, and perhaps changing around those independent variables. Examples: Rose watered with liquid vitamin B grow faster than roses watered with liquid vitamin E. Here, trial and error is leading to a series of findings.
The Statistical hypothesis: The statistical hypothesis is an examination of a portion of a population. Example: If you wanted to conduct a study on the life expectancy of residents of savannah. This is not practical. therefore, you would conduct your research using a statistical hypothesis, or sample of the savanna population.