You should have probably been familiar with the steps involved in scientific investigation i.e. Identifying problem, making hypothesis, generating data etc...

However, what I would like to emphasis in this post is the different types of variable.

You should know that "A variable is a quantity that varies in value". It represents "something" that are involved in a measurement in scientific investigation. Thus, a proper scientific investigation always involve variables and its measurement. A quantity that can be measured is called a physical quantity.

Three types of variables are:

**Manipulated variable**is a variable that is set or fixed before and experiment is carried out. it is usually plotted on x- axis.

**Responding variable**is a variable that changes according to and dependent to manipulated variable. it is usually plotted on y-axis.

**Fixed variable**is fixed and unchanged throughout the experiment.

Now lets see how to make inference and hypothesis?

**How to make inference and hypothesis?**

*Inference:*state the relationship between two VISIBLE QUANTITIES in a diagram or picture.

*Hypothesis:*state the relation ship between two MEASURABLE VARIABLES that can be investigated in a lab.

**How to tabulate data?**

-the name or the symbols of the variables must be labelled with respective units.

-all measurements must be consistent with the sensitivity of the instruments used.

-all the calculated values must be correct.

-all the values must be consistent to the same number of decimal places.

**A graph is considered well-plotted if it contains the following:**

- a title to show the two variables and investigation.

- two axes labelled with correct variables and units

- scales must be chosen carefully and graph must occupy more than 50% of the graph paper.

- all the points are correctly drawn.

- the best line is drawn.

## 2 comments:

thanks alot :)

thanks :)

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