Question

Sarah wants to know which brand of nail polish

lasts the longest without chipping. She buys 4
types of nail polish - Essie (which she normally
uses,) Butter, OPI, and Sally Hansen. Every
Sunday for 4 weeks she paints her nails with a
different brand of polish and records how many
days she lasts before she gets her first chip. She
makes sure to use the same bottom coat and top
coat with each type of polish, and she makes sure
to do the same weekly routine each week so that
her nails aren't getting treated more roughly
different weeks.
1. Independent variable:
2. Dependent variable:
3. Hypothesis:
4. Control group:
5. Experimental group:
6. Constants:

Answer 1

Answer: Independent variable is the one that is changed and controlled: the nail polish Sarah uses.

Dependent variable is the one that is studied, the result of the dependent variable: how long the nail polish lasts.

Hypothesis is the statement that has to be proved or declined during the experiment: different nail polish lasts a different period of time without chipping.

The control group is the not exposed to changes and the independent variable is part of this group: when Sarah paints her nails (4 Sundays in a row) and the type of bottom coat and top coat as well as the weekly routine.

The experimental group contains the independent variable and it is changed for the group: the type of nail polish.

The constants are Sally since she performs the experiment; the period of research, the routine and the coats.

Answer 2

Independent variable: Element that influences the appearance of a controlled and evaluable result, such as the enamel that Sarah will use on her nails.

Dependent variable: Element that is influenced by the dependent variable and promotes the visualization of a result, such as the length of time that the enamels can remain on the nail without chipping.

Experimental group: Element that allows the study of the interaction of these variables and the result developed through it, such as Sarah's enamel marks.

Control group: Element where only the independent variable is applied. As the action of the dependent variable does not exist, the observed result is the same that would be perceived if the study was not taking place, such as the day when Sarah did not paint her nails.

Constant: Elements that are exactly the same throughout the experiment, such as the person who conducted it, the time the study will be carried out, the nail care routine and the lower and upper layers of the enamels used.