Data and measurement

Question 1

Accuracy

Answer 1

The accuracy of a measurement relates to how close it is to the true value of the quantity being measured.

Question 2

Precision

Answer 2

Refers to how closely a set of measurement values agree with each other.
High precision means no outliers

Question 3

Repeatability

Answer 3

how close successive measurements of the same quantity are when carried out under the same conditions, within a short period of time (same producer, observer, setting, instructions and instruments)

Question 4

Reproducibility

Answer 4

extent to which successive measurements produce the same results when repeated under different conditions. (different participants, time, observer and environmental conditions)

Question 5

Internal validity

Answer 5

extent to which an investigation truly measures or investigates what it claims to.
Achieving:
No EV’s that way you are sure the DV is a measure of the IV

Large sample size to minimise the effect of outliers

Question 6

External validity

Answer 6

extent to which the results of an investigation can be applied to similar individuals in different settings. Only considered when internal validity is present.
Improving:
using a larger sample size making it more likely to be representative of the population.