Working scientifically

Question 1

state equation for uncertainty

Answer 1

(pos or neg) range / 2
range is highest - lowest repeat

Question 2

define random error +example

Answer 2

causes an unpredicatable error value in results
eg. parallax error - cuased by point of view

Question 3

define systematic error +example

Answer 3

gives the same error value every time
eg. zero error - when an instrument doesn’t read zero (eg. balance)

Question 4

define resolution

Answer 4

the smallest measurable amount (division) on a piece of equipment
eg. ruler resolution = 1mm

Question 5

define repeatability

Answer 5

you will get the same results when repeating the experiment

Question 6

define reproducibility

Answer 6

different scientists will get the same results

Question 7

define true value

Answer 7

result obtained in ideal conditions with no errors

Question 8

define accuracy

Answer 8

how close the results are to the true value

Question 9

define precision

Answer 9

how close repeat readings are

Question 10

define validity

Answer 10

whether the results show the correct/true value
variables were successfully controlled for a fair test