Practical Analysis📏

Question 1

Precision

Answer 1

When repeated measurements of the same quantity give values that are close in agreement

Question 2

Accuracy

Answer 2

How close the results of an experiment are to the ‘true value’

Question 3

Repeatability

Answer 3

The closeness of agreement between independent results obtained with the same method on identical test material and same conditions

Question 4

Reproducibility

Answer 4

closeness of agreement between independent results obtained with the same method on identical test material but under different conditions

Question 5

Mistakes

Answer 5

Avoidable errors

• misreading numbers on scale
• spillages

Question 6

Systematic error

Answer 6

Produces a constant bias in measurement that can’t be avoided by repeating the measurement

-faulty equipment

Question 7

Random error

Answer 7

errors that follow no regular pattern

• difficulty judging meniscus
• uncertainty of last decimal place of measurement

Question 8

Validity

Answer 8

Refers to whether the evidence supports the argument

Question 9

Independent variable

Answer 9

Variable manipulated by experimenter to observe its effect on the dependent variable.

Question 10

Dependent variable

Answer 10

The variable that is measured or observed to determine the effect of the changes in the independent variable

Question 11

Controlled variable

Answer 11

A variable that must be kept constant during an investigation