Experiments And Data

Question 1

Observation

Answer 1

Carefully looking at a process of an object

Question 2

Investigation

Answer 2

An experiments or set of experiments designed to produce data

Question 3

Data

Answer 3

Words or number

-you obtain when making observations or measurements

Question 4

Variable

Answer 4

A quantity that can change

Question 5

Independent variable

Answer 5

A quantity that you can change which will affect the dependent variable

Question 6

Dependent variable

Answer 6

A variable that is affected by the independent variable

Question 7

Control variable

Answer 7

A variable that you have to keep the same in an investigation

Question 8

Prediction

Answer 8

Statement that says what you think will happen

Question 9

Plan

Answer 9

-description of how you will use equipment to collect valid data

Question 10

Precise

Answer 10

A set of repeat measurements that are close together

Question 11

Spread

Answer 11

Highest - lowest measurements of a set of repeat measurements

Question 12

Uncertainty

Answer 12

The doubt in the result because of the way that a measurement is made

Question 13

Repeatable

Answer 13

When you repeat measurements in an investigation and get similar results

Question 14

Reproducible

Answer 14

When other people carry out the same investigation and get similar results to the original investigation

Question 15

Continuous

Answer 15

A variable that has value ps that can be any number

Question 16

Categoric

Answer 16

A variable that has values that are words

Question 17

Discrete

Answer 17

A variable that can only have whole number values

Question 18

Range

Answer 18

-difference between highest and lowest values of a variable

Question 19

Risk assessment

Answer 19

A description of how you will ensure less injury or damage

Question 20

Accurate

Answer 20

• Close to the true value of what you are measuring

- data can be precise but no accurate

Question 21

Investigation should include

Answer 21

• what equipment will be used + why

- methods used +why

Question 22

Plans should include

Answer 22

• scientific question
• independent/ dependent variable
• list of variables to control + how
• prediction
• list of equipment
• risk assessment
• how to use equipment to collect accurate/precise data

Question 23

Outlier

Answer 23

A result that is very different from other measurements in a data set

Question 24

Mean

Answer 24

An average of a set of data

-found by adding together all the values and dividing by the number of values in the set

Question 25

Line graph

Answer 25

A way of presenting results when there are two numerical values

Question 26

Bar chart

Answer 26

Presenting data when one variable is discrete and the other is continuous

Question 27

Pie chart

Answer 27

Presenting data when one variable is discrete and the other is continuous

Question 28

Plotting values of graphs …

Answer 28

• plot independent variables on x axis

- plot dependent variable on y axis

Question 29

Analyse

Answer 29

Looking at data and writing about discoveries

Question 30

Line of best fit

Answer 30

A smooth line on a graph that travels through as many points as possible

Question 31

Conclusion

Answer 31

Everything you have found out during the investigation

Question 32

How to analyse data

Answer 32

• state what the investigation shows
• describes any relationships between the two variable + use evidence
• compare results with prediction

Question 33

Evaluate

Answer 33

-discuss quality of data collected during the investigation and suggest improvements to method

Question 34

Confidence (in conclusion)

Answer 34

-how sure you are of your conclusion based on data collected

-

Question 35

Random error

Answer 35

-error that causes a random difference between a measurement and the true value each time it is measured

Question 36

Systematic error

Answer 36

-error that causes the same difference between each measurement and the true value every time it is measured

Question 37

Ways of evaluating your investigation

Answer 37

• discuss quality of the data and investigation

- suggest ways to improve methods so that better quality data is collected next time