Question

variables (the data you are measuring)
a. independent variable is the variable that changes in relation to the changes in its
independent variable. the independent variable is the effect, result, or what happens from
the experiment.
controlled/constant variables (what stays the same)
a. controlled/constant variable is the variable that is constant and unchanged throughout the
of the investigation.
application of independent and dependent variables
using the given practice problems to check for understanding of independent and dependent
variables. read the problems and identify the independent and dependent variable in each.

1. the higher the temperature of the water, the faster the egg will boil.

a. independent variable (iv): temperature
b. dependent variable (dv): egg
c. controlled/constant variable (cv): same size water, the type of egg

1. the score on the final test depends on the number of spelling mistakes made.

a. iv: spelling
b. dv: scores
c. cv: same test

1. students of different age groups were asked to put the same jigsaw puzzle together.

they were timed to see how long it took.
a. iv: age group
b. dv: the time it took to put the puzzle together
c. cv: jigsaw puzzle

Explanation:

Problem 1

To identify the independent, dependent, and control/constant variables, we analyze the relationship: water temperature affects egg boiling speed. The independent variable (IV) is what we manipulate (temperature), the dependent variable (DV) is what we measure (egg boiling speed), and the control/constant variable (CV) is what stays the same (amount of water, egg type, etc.).

The score on a local test depends on spelling practice. The IV is the practice (spelling), DV is the score, and CV is the same test (to ensure consistent measurement).

The time to complete a puzzle depends on the age group. IV is age group (manipulated), DV is time (measured), and CV is the same jigsaw puzzle (to keep the task consistent).

Answer:

a. Independent Variable (IV): Temperature of the water
b. Dependent Variable (DV): Speed at which the egg boils
c. Control/Constant Variable (CV): Amount of water, type of egg

Problem 2