Sci method and experimentation

Question 1

What are the eleven principles of experimentation?

Answer 1

Planning and design, safety procedures, random selection, large sample size, control group, double-blind testing, change one variable at a time, measure changes, analyse the results, state possible sources of error, repeat the experiment

Question 2

What is planning and design?

Answer 2

.

Question 3

What are safety procedures?

Answer 3

.

Question 4

What is a control experiment?

Answer 4

.

Question 5

What is the sample size?

Answer 5

.

Question 6

What is random selection?

Answer 6

.

Question 7

What is replication?

Answer 7

.

Question 8

What is double-blind testing?

Answer 8

.

Question 9

What are sources of errors?

Answer 9

.

Question 10

What is an experiment?

Answer 10

An experiment is a controlled test where only one variable is changed at a time

Question 11

What is the rule regarding variables?

Answer 11

Only one variable should be changed at a time

Question 12

What is the name of the variable that is changed?

Answer 12

The independent variable

Question 13

What variables are changed?

Answer 13

The independent variable is changed by the experimenter.

Question 14

What is the dependent variable?

Answer 14

The variable affected during the experiment (responding)

Question 15

What is a constant?

Answer 15

The part of an experiment that does not change

Question 16

What are controlled variables?

Answer 16

Variables which could change but are not allowed to

Question 17

What are the two parts to an experiment?

Answer 17

The control group and the experimental group

Question 18

What is the control group part of the experiment?

Answer 18

An experiment carried out alongside the main experiment in which nothing is changed or influenced which is then compared to the experimental group to ensure any changes are caused by changing the independent variable

Question 19

What is the experimental group part of an experiment?

Answer 19

The experimental group is the main experiment in which the independent variable is changed by the experimenter and nothing else

Question 20

What is the goal of experiments?

Answer 20

Prediction

Question 21

Give an example of an experiment, it’s parts and whether it’s good and problems with it

Answer 21

An example of an experiment
Observation: It has been suggested that large daily doses of Vitamin C protect against the common cold virus.
Hypothesis: Vitamin C protects against the common cold virus
Experiment design: Ten adult males in their mid twenties who are friends of the investigator were chosen to test the possible value of vitamin C.
5 of them were given 3000mg of vitamin C a day; the other 5 were given a placebo.
The control group are the ones with the placebo
The experimental group are the ones with the vitamin c.
Problems with experiment design
All males
All mid twenties
All friends
Not a large enough sample

Question 22

What should a good experiment have?

Answer 22

Only one variable, a large number of samples, random selection, repetition and double blind testing