1. susie wondered if the height of a hole punched in the side of a quart-size milk carton would affect how far from the container a liquid would spurt when the carton was full of the liquid. she used 4 identical cartons and punched the same size hole in each. the hole was placed at a different height on one side of each of the containers. the height of the holes varied in increments of 5 cm, ranging from 5-20 cm from the base of the carton. she put her finger over the holes and filled the cartons to a height of 25 cm with a liquid. when each carton was filled the proper level, she placed it in the sink and removed her finger. susie measured how far away from the carton’s base the liquid had squirted when it hit the bottom of the sink.

hypothesis:
independent variable:
dependent variable:
constant (at least one):
control:
number of groups:
number of trials per group:

A scientific experiment is performed to test the hypothesis which is the predicted idea about the natural phenomenon based on the previous research.

The experimental design must contain three types of variables: the variable which can be manipulated  (independent variable). the variable which is to be tested (dependent variable) and the variable which is kept constant throughout the experiment (constant variable).

The experimental sample is divided into two groups: the experimental group which includes the factor to be studied and the control group which lack the factor to be studied.

In the given question,

1. Hypothesis:  liquid spurt when falls form a height.

2. Independent Variable:  Height of hole which gets changed

3. Dependent Variable:  Range of squirt which is to be tested

4. Constant (at least one):the volume of filled liquid is kept constant

5. Control: 4 identical cartons which are punched with a hole of the same size.

6. A number of groups:  two (control and experimental)

7. Number of trials per group: four