Question

Define null hypothesis,alternative hypothesis,reactivity

Answer 1

Null hypothesis:

Researchers conducts experiments to answer a question or to prove a statement. If he proved that successfully,other scientists argues on that statement based on statistical techniques.Because there are large statistical techniques are invented, By using those techniques other scientists easily blame proved statements eventhough that is correct.

To overcome this problem researchers proposes exact opposite statement to their goal.That exact opposite statement called as null hypothesis.Researchers proves that null hypothesis is wrong.Then automatically actual statement will become correct.

Alternative hypothesis:

Researchers conducts research to prove a statement or to answer a question.That statement or that question called as alternative hypothesis.It exactly opposite to null hypothesis.

Reactivity:

Most of the research studies based on observing human beings.If people or participants know that they are being observed by someone they behave in observer desirable manner.This type of reaction by participants are called Reactivity.