Hypothesis is an approximate explanation that relates to the set of facts that can be tested by certain further investigations. There are basically two types of hypothesis, namely null hypothesis and alternative hypothesis. A research generally starts with a problem. Next a hypotheses like null hypothesis and alternative hypothesis provide the researcher with some specific restatements and clarifications of the research problem.

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The criteria of the research problem in the form of null hypothesis and alternative hypothesis should be expressed as a relationship between two or more variables. The criteria of the null hypothesis and alternative hypothesis is that the statements should be the one that expresses the relationship between the two or more measurable variables. The null hypothesis and alternative hypothesis should carry clear implications for testing and stating relations.

The major differences between the null hypothesis and alternative hypothesis and the research problems are that the research problems are simple questions that cannot be tested. The null hypothesis and alternative hypothesis, however, can be tested.

The null hypothesis and alternative hypothesis are required to be fragmented properly before the data collection and interpretation phase in the research. A well fragmented null hypothesis and alternative hypothesis indicates that the researcher has adequate knowledge in that particular area and is thus able to take the investigation further because they can use a much more systematic system. The null hypothesis and alternative hypothesis give direction to the researcher on his/her collection and interpretation of data.

The null hypothesis and alternative hypothesis are useful only if the null hypothesis and alternative hypothesis state the expected relationship between the variables or if the null hypothesis and alternative hypothesis are consistent with the existing body of knowledge. The null hypothesis and alternative hypothesis should be expressed as simply and concisely as possible. The null hypothesis and alternative hypothesis are useful if the null hypothesis and alternative hypothesis have explanatory power.

The purpose and importance of the null hypothesis and alternative hypothesis are that the null hypothesis and alternative hypothesis provide an approximate description of the phenomena. The purpose of the null hypothesis and alternative hypothesis is to provide the researcher or an investigator with a relational statement that is directly tested in a research study. The purpose of the null hypothesis and alternative hypothesis is to provide the framework for reporting the inferences of the study. The purpose of the null hypothesis and alternative hypothesis is to behave as a working instrument of the theory. The purpose of the null hypothesis and alternative hypothesis is to prove whether or not the test is supported, which is separated from the investigator’s own values and decisions. The null hypothesis and alternative hypothesis also provide direction to the research.

The null hypothesis is generally denoted as H0. The null hypothesis states the exact opposite of what an investigator or an experimenter predicts or expects. The null hypothesis basically defines the statement which states that there is no exact or actual relationship between the variables.

The alternative hypothesis is generally denoted as H1. The alternative hypothesis makes a statement that suggests or advises a potential result or an outcome that an investigator or the researcher may expect. The alternative hypothesis has been categorized into two categories: directional alternative hypothesis and non directional alternative hypothesis.

The directional hypothesis is a kind of alternative hypothesis that explains the direction of the expected findings. Sometimes this type of alternative hypothesis is developed to examine the relationship among the variables rather than a comparison between the groups.

The non directional hypothesis is a kind of alternative hypothesis that has no definite direction of the expected findings being specified.