Working scientifically

Question 1

Evidence needs to be…

Answer 1

Repeatable, Reproducable and Valid.

Question 2

What does CHIMED stand for?

Answer 2

CHange - Independent.
MEasured - Dependant.

Question 3

What does accurate mean?

Answer 3

Data that’s close to the true answer.

Question 4

What does precise mean?

Answer 4

Data is all close to the average.

Question 5

What is an example of a random error?

Answer 5

A human mistake in measuring.

Question 6

What is an example of a systematic error?

Answer 6

Measuring from the wrong point on a ruler every time.

Question 7

What is a zero error?

Answer 7

Using equipment that isn’t zeroed properly.

Question 8

How do we reduce random errors?

Answer 8

Repeat the experiment to find a mean.

Question 9

What are the standard units for
- mass,
- length and
- time in biology?

Answer 9

kg, m, s.

Question 10

What are the 3 possible reasons for a correlation?

Answer 10

• Chance.
• Linked by a 3rd variable.
• Cause.

Question 11

What is the equation for uncertainty?

Answer 11

uncertainty = range/2

Question 12

What are the 4 questions asked to evaluate an investigation?

Answer 12

1. Was the method valid & fair?
2. Could we draw a conclusion?
3. Was it repeatable, reproducable, accurate and precise?
4. Were there anomalous results?