Skills Of Scientific Investigation

Question 1

What is used to determine if one variable, the independent, causes or has effect on another variable, the dependent?

Answer 1

Controlled experiment

Question 2

What are observations of the subject phenomena, without interfering with or influencing it?

Answer 2

Observational studies

Cannot manipulate one thing to control another

Question 3

What is a variable?

Answer 3

Condition that can change [one at the time]

Question 4

What is the variable that the experimenter changes and observes the affect of [the “cause” variable]?

Answer 4

Independent variable

Question 5

What is the variable change is being measured orobserved as a result of applying the independent [the “effect” variable]?

Answer 5

Dependent variable

Question 6

How many variables should change and what variables are these?

Answer 6

Only one, the dependent variable. All of the other variables which could cause it to in the dependent variable are unchanged or controlled

Question 7

What is an experiment design in which the independent variable is not applied? What is it used for?

Answer 7

Control group it is used to compare the effect of any change on the test group

Question 8

What is an experiment design in which a change in the independent variable is applied in the effect of this change is measured observed?

Answer 8

Test group

Question 9

The two things you need to do when you’re initiating and planning an experiment?

Answer 9

1. Have a purpose

2. Create a hypothesis

Question 10

What is a quantitative property?

Answer 10

Measured and recorded with numbers and units

Question 11

What is a qualitative property?

Answer 11

Observed with our senses and recorded with adjectives

Question 12

On a graph what goes on the X axis?

Answer 12

The independent variable [time, hours]

Question 13

On a graph what goes on the Y axis?

Answer 13

Dependent variable [degrees C]

Question 14

What is an absolute point?

Answer 14

(0,0)

Question 15

What does a small circle around a data point mean?

Answer 15

It’s not 100% accurate

Question 16

On a graph if one variable is qualitative and you want to indicate percentage of the whole what graph you use?

Answer 16

Use a pie or circle graph

Question 17

On a graph, if both variables are quantitative, what graph do you use?

Answer 17

A point line graph

Question 18

On a graph, if one variable is qualitative and you simply want to present the data, what graph do you use?

Answer 18

A bar graph

Question 19

If the line of a graph is climbing up, what does it have?

Answer 19

Positive correlation or direct relationship

Question 20

If the line on a graph is going down, what does it have?

Answer 20

Negative correlation or indirect relationship

Question 21

If the data of a graph is scattered, what does it have?

Answer 21

Zero correlation or no relationship