Year 13 Science Exam revision

Question 1

What are the main points you have to do to get all the marks in question 1?(reading time question)

Answer 1

Circle anomalous data, don’t include anomalous data in the mean, curve of best fit for a curve/line of best fit for a line, round mean into the same decimals as the given data

Question 2

What should you include in your investigation plan?

Answer 2

Hypothesis 
Equipment list - with justification 
Risk assessment 
Control variable 
Dependant variable - units, how its measured, the precision
Independent variable - how its measured, intervals taken to measure
Results table
Further using the data

Question 3

Define independent, dependant and control variables

Answer 3

Independent variable - the one you change/investigate the effect of
Dependent variable - the one you measure
Control variable - the one you keep the same

Question 4

Define directly proportional and examples

Answer 4

As one increases the other increases at the same rate

E.g., a car consumes more fuel the more distance it drives

Question 5

What is the formula for percentage error?

Answer 5

Maximum error
—————————- X 100
Measured value

Question 6

What is the null hypothesis?

What happens when the chi value calculated is lower than the critical value?

Answer 6

“There is no statistically significant difference”

You accept the null hypothesis