1.1 keywords

Question 1

accuracy

Answer 1

A measure of how close the data is to the actual true value. Not the difference between accuracy precision. If a man is 1.81m tall, a measurement of 1.743 is precise but not accurate. -use more decimal places

Question 2

precision

Answer 2

Precision: The closeness of repeated measurements to one another. Precision involves choosing the right apparatus and using it properly. Precise readings are not necessarily accurate. A faulty piece of equipment or incorrectly used apparatus may give preide readings (all repeated values are close together) but inaccurate (not true) results. Eg in an experiment with a colorimeter, using a dirty of scratched cuvette (sample tube) might give precise readings but they will be highly inaccurate.
(is apparatus damaged)

Question 3

reliability

Answer 3

Reliability: If a measurement or test is reliable, it gives consistent results each time the activity is repeated. When undertaking an investigating a large number of repeats should ideally be taken, and any readings that vary considerably from the others (anomalous) should be repeated.

Question 4

Validity

Answer 4

Validity: The confidence that researchers put in a set of results and the conclusions drawn from those results. Results are valid if they measure what they are supposed to, and if they are precise, accurate and reliable.
Validity- was the investigation taken out on the correct assumptions and were results logically drawn