1. Presentation on:
Null and Alternative hypothesis
Presentation to:
Dr. Imran Qadir
Presentation by:
Zahra Naz --------- BSBT-04
2. Hypothesis
“Statement created by researchers when they
surmise outcome of a research/experiment”
Precursor of hypothesis is a “problem”
Types:
1. Null hypothesis
2. Alternative hypothesis
3. 1. Null hypothesis: (Ho)
It expresses the idea of no difference in the observation
Shows equality level between variables in observation
In this, we are sure that our expectation will definitely
happen
2. Alternative hypothesis: (H1)
It expresses the idea of conflict or difference in the
observation
There is inequality between the variables in observation
In this, we expect things to happen
It is the hypothesis that a researcher wants to test.
4. Example 1:
Observation is:
“Children have a higher IQ-level if they eat oily fish for a
period of time.”
Then,
Null hypothesis would be:
“Children who eat oily fish for six months do not show a
higher IQ increase than children who do not.”
Alternative hypothesis would be:
“Children who eat oily fish for six months will show a higher
IQ increase than children who have not.”
5. Example 2:
Observation:
“Extroverts are healthier than introverts”
So,
Null hypothesis will be:
“Extrovert and introverts are equally healthy”
Alternative hypothesis will be:
“Introverts are not healthier than extroverts”
