Presentation on:

Null and Alternative hypothesis

Presentation to:Dr. Imran Qadir

Presentation by:Zahra Naz --------- BSBT-

04

Hypothesis

“Statement created by researchers

when they surmise outcome of a

research/experiment”Precursor of hypothesis is a “problem”

Types:1. Null hypothesis2. Alternative hypothesis

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.

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.”

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”