Here is what we do for directional hypothesis testing:

We decide: "The data (and its sample mean) are significantly different than the value of the mean hypothesized under the null hypothesis, at the .001 level of significance." This decision is likely to be wrong (Type I error) 1 time out of 1000.

For example, a researcher might be interested in the relationship between study habits and .

Even in situations where the hypothesis is unsupported by the research, this does not mean that the research is without value. Not only does such research help us better understand how different aspects of the natural world relate to one another, it also helps us develop new hypotheses that can then be tested in future research.


1. What is the purpose of hypothesis testing?

Example: We compare the observed mean birth weight with the hypothesized values of 18 grams.

An Example: Heart attacks in rabbits. When heart muscle is deprived of oxygen, the tissue dies and leads to a heart attack ("myocardial infarction"). Apparently, cooling the heart reduces the size of the heart attack. It is not known, however, whether cooling is only effective if it takes place before the blood flow to the heart becomes restricted. Some researchers (Hale, et al, 1997) hypothesized that cooling the heart would be effective in reducing the size of the heart attack even if it takes place after the blood flow becomes restricted.


Specifying a Purpose and Research Questions or Hypotheses

The first step of a psychological investigation is to identify an area of interest and develop a hypothesis that can then be tested. While a hypothesis is often described as a hunch or a guess, it is actually much more specific. A hypothesis can be defined as an educated guess about the relationship between two or more variables.

Transcript of Specifying a Purpose and Research Questions ..

Before you come up with a specific hypothesis, spend some time doing background research on your topic. Once you have completed a literature review, start thinking of potential questions you still have.

purpose/ hypothesis? | Yahoo Answers

They would then propose a hypothesis about how these two variables are related, such as "test anxiety decreases as a result of effective study habits."

What Are Examples of a Hypothesis? - ThoughtCo

In the scientific method, falsifiability is an important part of any valid hypothesis. This does not mean that the hypothesis is false; instead, it suggests that if the hypothesis were false, researchers could demonstrate this falsehood.

Purpose of hypothesis by Rosio Stone - issuu

The researcher might pose a specific hypothesis that "People tend to select romantic partners who are similar to them in interests and educational level."