science assessment practical term 3

Question 1

Indépendant variable

Answer 1

is a deliberately changed variable in the experiment

Question 2

which axis does the independant variable lie on

Answer 2

x axis (horizontal)

Question 3

dependant variable

Answer 3

is the variable being measured and are often changed by the independant variable

Question 4

which axis does the dependant variable lie on

Answer 4

y axis (vertical)

Question 5

controlled variable

Answer 5

variables that are constant throughout the experiment

Question 6

how can you tell what the most significant controlled variable is

Answer 6

the controlled variable that effects the dependant variable the most

Question 7

what is accuracy?

Answer 7

how close the results are to it’s true value

Question 8

what is the reliability of a experiment?

Answer 8

it is if when the experiment is repeated many times the results are constantly similar with no outliers

Question 9

what is the validity of a experiment?

Answer 9

if it is a fair text and there is no errors within the variable

Question 10

fair test

Answer 10

a fair test is determined if all the controlled variables stay constant throughout the experiment and if only the independant variable is changed. also if the dependant variable is measured correctly with no bias.

Question 11

what are relationships in an experiment.

Answer 11

for answering questions describing relationships. use comparison wording for the independant variable and dependant variable

Question 12

what are trends and patterns in an experiment.

Answer 12

trends and patterns can be found from graphs

Question 13

things that all graphs must have

Answer 13

• must be done with pencil and ruler
• scale that is approximate and with evenly spaced increment
• label the axes variables (unit)
• write the title of the graph on top

Question 14

hypothesis sample

Answer 14

if IV then DV

Question 15

what is an aim

Answer 15

the statement of the experiment’s purpose

Question 16

what is a risk assessment

Answer 16

table of identified risk, which identified the assessed risks and how to control them.

Question 17

aim sample

Answer 17

to VERB the effect of IV on DV

Question 18

risk assessment examples

Answer 18

include: appropriate safety precautions based on severity and likelihood of injury. common ones are tying up hair, wearing safety googles etc

Question 19

method

Answer 19

the procedure of the experiment in steps in a chronological order

Question 20

things methods must have

Answer 20

1. must be numbered steps
2. in past tense
3. start with verb
4. the method must be repeatable
5. mentions iv,dv and cv

Question 21

conclusion

Answer 21

summary of the aim and results of the experiment

Question 22

things conclusion must have

Answer 22

• state whether or not the results supported or refuted your hypothesis
• use timeless present
• no personal pronouns use general terms

Question 23

testable question samples

Answer 23

• how does IV affect DV
• what happens to DV if IV

Question 24

discrete data

Answer 24

stand alone data e.g colour and location

Question 25

Continuous data

Answer 25

data that has continuous values e.g time,length, mass

Question 26

how to scale axes

Answer 26

1. find the range for the variable
   - range = largest - smallest value
2. divide the range by the number of intervals
   - after dividing you many need to round up
3. use the rounded number to mark off the intervals along the axis
   - the interval must be the same amount each time