null hypothesis non directional example

While directional and non-directional hypotheses involve some integrated expectations about the outcomes (either distinct direction or a vague relationship), a null hypothesis operates on the premise of negating such relationships or effects.

This guide delves into non-directional hypothesis examples across various fields, outlines a step-by-step approach to crafting them, and provides expert tips to ensure your non-directional hypotheses are robust and insightful.

Null Hypothesis (H0): The sample data occurs purely from chance. Alternative Hypothesis (HA): The sample data is influenced by some non-random cause. A hypothesis test can either contain a directional hypothesis or a non-directional hypothesis:

A non-directional hypothesis simply predicts that there will be a difference, without predicting which direction it will go. For the BMI/activity example, a non-directional null hypothesis would be: H 0: B M I a c t i v e = B M I i n a c t i v e H0: BMI_{active} = BMI_{inactive} and the corresponding non-directional alternative hypothesis would be:

When writing hypotheses there are three things that we need to know: (1) the parameter that we are testing (2) the direction of the test (non-directional, right-tailed or left-tailed), and (3) the value of the hypothesized parameter.

The null and alternative hypotheses are two competing claims that researchers weigh evidence for and against using a statistical test: Null hypothesis (H0): There’s no effect in the population. Alternative hypothesis (Ha or H1): There’s an effect in the population.

The null hypothesis, positing no effect or relationship, is a foundational contrast to the research hypothesis in scientific inquiry. It establishes a baseline for statistical testing, promoting objectivity by initiating research from a neutral stance.

Directional hypothesis: A directional (or one tailed hypothesis) states which way you think the results are going to go, for example in an experimental study we might say…”Participants who have been deprived of sleep for 24 hours will have more cold symptoms in the following week after exposure to a virus than participants who have not been slee...

A non-directional research hypothesis in symbols should look like this: \( \displaystyle \bar{X} eq \mu \) (The mean of the sample is not equal to the mean of the population). Exercise \(\PageIndex{1}\)

Is a null hypothesis directional or non-directional? A hypothesis test can either contain an alternative directional hypothesis or a non-directional alternative hypothesis. A directional hypothesis is one that contains the less than (“<“) or greater than (“>”) sign.