Newton 3

Question 1

Explain what are instrumental errors?

Answer 1

All measuring devices are potential sources of systematic error. Instruments need careful and regular calibration, experimental determination should always be carried out within the conditions of the calibration.

Question 2

Explain what are method errors?

Answer 2

Due to inadequacies in physical or chemical behaviour of reagents/ reactions used in determination.

Question 3

Explain what are personal errors?

Answer 3

Many measurements require personal judgements, examples include the position of a pointer between two scale divisions, the determination of an end point in a titration or the level of a liquid with respect to a graduation in a pipette or burette.

Question 4

How to minimise method error?

Answer 4

Use 2 or more independent analysis techniques to cross check.

Question 5

Are there any difference between sample mean and population mean?

Answer 5

Yes, but thr conformity of these values increases as the sample size gets larger.

Question 6

What is the formula for standart diviation?

Answer 6

Question 7

What is the equation for standart deviation for a sample?

Answer 7

Question 8

What is the equation for addition or substraction standart deviation?

Answer 8

Question 9

How you define the standart error of the mean?

Answer 9

Question 10

What is confidence interval?

Answer 10

An interval surrounding the experimentally determined mean within which the population mean µ is expected to lie with a certain degree of probabiliy.