Module 4

Question 1

the process of getting the actual measure of an object’s dimension or property by comparing with something that has been accepted as a standard unit

Answer 1

MEASUREMENTS

Question 2

Simply compare object’s dimension or property with some given standards

Answer 2

DIRECT

Question 3

A computation is made from quantities which have been measured directly

Answer 3

indirect

Question 4

due to the imperfection of the measuring instrument

Answer 4

INSTRUMENTAL MEASUREMENT ERRORS

Question 5

Due to measuring errors by the individual

Answer 5

PERSONAL ERRORS

Question 6

Constant over several measurements

Answer 6

SYSTEMATIC ERROR

Question 7

Changes during the measurements

Answer 7

RANDOM ERROR

Question 8

Caused by the imperfection of measuring methods and inaccuracy of instruments

Answer 8

systematic errors

Question 9

mean the individual errors that are given rise to the person performing the measurements

Answer 9

random errors

Question 10

incorrect reading of the tenth graduation of an instrument scale

Answer 10

random error

Question 11

small changes of the measurement conditions

Answer 11

random error

Question 12

asymmetric placement of the indicator mark

Answer 12

random error

Question 13

sum of observations divided by the number (n)

Answer 13

arithmetic mean

Question 14

difference between a data point and the mean

Answer 14

deviation = Si = xi - mean

Question 15

sum of the squared deviations divided by n-1

Answer 15

dispersion or variance

Question 16

square root of the dispersion

Answer 16

sample standard deviation

Question 17

difference between the largest and smallest observations in a sample

Answer 17

confidence interval

Question 18

smallest division of the measuring instrument

Answer 18

confidence interval of systematic error

Question 19

the confidence interval of the total error as a percentage of the mean

Answer 19

relative error