measurements and errors

Question 1

how to find absolute uncertainty of a range of data

Answer 1

absolute uncertainty = range/2

Question 2

how to find percentage uncertainty of a range of values

Answer 2

percentage uncertainty = (absolute uncertainty/mean value)x100

Question 3

formula for percentage uncertainty of a value

Answer 3

absolute uncertainty/value x100

Question 4

how to calculate uncertainty when adding or taking away values

Answer 4

• add absolute uncertainty’s

Question 5

how do you calculate uncertainty’s when multiplying or dividing values

Answer 5

• add the percentage uncertainty

Question 6

how to find the percentage uncertainty of a value raised to a power

Answer 6

• x percentage uncertainty by value

Question 7

what is a random error
how can they be reduced

Answer 7

unpredictable fluctuations in a devises readings from uncontrollable factors

they can be reduced by doing multiple readings and taking an average

Question 8

what is a systematic error

Answer 8

stems from a fault in an instrument or a fault in the method

instruments can be recalibrated
changes need to be made to the method

Question 9

what is zero error

Answer 9

type of systematic error where the instrument gives a reading even tho the true reading is zero