Sci Method Flashcards
Hypothesis
Educated guess
double blind testing
Neither the tester nor the subject knows who gets the drug
Necessity for random selection
Reduces bias
Features of good experimental design
Control
Large sample size
Results published
Journal
Why
Peer review
Experiment
Test of hypothesis
Theory
Hypothesis supported by experiment
Why seeds taken from one plant
To minimise variation
A way scientists sterilise compost
Heat
Why is that important
Kill organisms
Why did they divide young plants into equal groups
Control
Why did they keep plants under identical conditions
To only have 1 variable
Two conditions kept constant
Temp and ph
Why did they repeat several times
To ensure reliability
Purpose of hypothesis
To form basis or prediction
Double blind testing
Neither the experimenter nor the test group knows who gets what
Why is it important they came from same mother
So they are genetically similar
Why is a control essential
To compare with experiment
Why 25 tadpoles
Larger sample makes allowance for illness
How it would be carried out
Différent concentrations of iodine
Made up using pond water
25 tadpoles in each solution
Two factors kept constant
Temp
Amount of food
Limitation of scientific method
Our basic knowledge
