Skills review

Question 1

Distinguish between independent, dependent and controlled variables, providing examples of each.

Answer 1

The variable the experimenter manipulates or changes E.g. The type of soda – diet or regular – is the independent variable.
The dependent variable is the variable that is being measured or tested in an experiment. The level of blood sugar that you measure is the dependent variable – it changes depending on the type of soda.
An experimental element which is constant and unchanged throughout the course of the investigation. If a temperature is held constant during an experiment, it is controlled.

Question 2

Distinguish between qualitative and quantitative observations, providing examples for each.

Answer 2

A research method in which researchers collect data using their five senses, sight, smell, touch, taste, and hearing. Texture (smooth or rough) or taste (salty or sweet)
Objective collection of data which is primarily focused on numbers and values. Age and weight

Question 3

What is a control?

Answer 3

An experiment conducted without an independent variable

Question 4

Difference between
Reliability
Accuracy
Validity

Answer 4

The extent to which the findings of repeated experiments, conducted under identical or similar conditions, agree with each other.
The extent to which a measured value agrees with its true value
The extent to which an experiment addresses the question under investigation.