Measurement & Data Reliability

Question 1

What is the drug analysis process?

Answer 1

1- Select sample 
2- extract analyte
3- purify analyte
4- characterisation 
5- data validity

Question 2

How many sig figs to round to in decimals?

Answer 2

3 sig figs

Question 3

RULES for rounding in + & - ?

Answer 3

Round to the no decimal as the value with the least sig figs

Question 4

RULES for rounding in division & multiplication?

Answer 4

Round to same no sig figs as the value with least sig figs

Question 5

Is the 0 before a decimal sig fig?

Answer 5

NO

Question 6

Is 0 after decimal sig fig?

Answer 6

YES

Question 7

Which value to write from digital scales

Answer 7

The whole value you see

Question 8

Which value to write from scaled instruments?

Answer 8

One more figure than you can read with certainty

Question 9

What is precision?

Answer 9

How close values are to each other

Question 10

What is accuracy?

Answer 10

How close values are to target

Question 11

What is an intermediate / random error?

Answer 11

It affects precision more than accuracy

Question 12

What is determinate / systematic error?

Answer 12

Affects accuracy more than presiding

Question 13

Can systematic error be improved?

Answer 13

YES

Question 14

What is a gross error?

Answer 14

Big mistake- outlier

Question 15

How to calculate precision?

Answer 15

Range

highest - lowest value

Question 16

Difference between SD and relative SD?

Answer 16

Relative SD removed units- can be compared globally

Question 17

What can be the origins of systematic errors?

Answer 17

1- instrumental
2- method
3- personal E.g. height

Question 18

What is the T test used for?

Answer 18

Used to compare 2 averages and calculate confidence intervals when SD not present

Question 19

Reject null hypothesis if?

Answer 19

If difference in values