Answer: As height increases, typically weight increases.
Explanation: Positive correlation can be defined as a reciprocal, parallel or complementary relationship between two or more comparable objects where where if one variable increases, the other one also increases. A positive correlation also exists in one decreases and the other also decreases.
Answer:
A control should have been included in the investigation
Explanation:
It is impossible for the student to interpret a correct conclusion about his experiment, without adding a control treatment where he can really compare the differences between the variables.
Control treatment is an element of research that receives all factors, except the variable being tested. The control serves to make comparisons with the other treatments, allowing to observe the exact difference between a system where the variable was tested and the system where it was not.
In the case of the question above, it would have been necessary for the student to have placed a cart on a ramp of normal height and without sandpaper. That way he could compare the speed between this cart and the carts on the other ramps, thus having a correct result.
The correct answer is letter D
Mahatma Gandhi was a recognized Indian activist who fought during the 1920s and 1940s for the end of the English colonial regime and for India's independence.
This is an example of psychological conditioning. When a stimulus (a flash of light) is paired with a consequence (an electric shock), the subject has a particular behaviour (pulling the finger away). After enough repetition, the subject will learn to associate the two, and the stimulus will be enough to motivate the behaviour, even when no consequence is present.
After several trials without the consequence, the subject will again dissociate the stimulus from the behaviour, and will go back to his pre-study pattern, in a process called extinction.
