Practical Revision

Question 1

Discrete Data?

Answer 1

Data collected by counting such as number of weights

Question 2

Continuous Data?

Answer 2

Can take any value of a scale such as current reading from an ammeter

Question 3

Directly Proportional?

Answer 3

Two variables plotted against each other and they produce a straight line relationship going through the origin

Question 4

Random Error?

Answer 4

Cause readings to be spread about the true value due to results varying in an unpredictable way

Question 5

Systematic Error?

Answer 5

Each reading differs from the true value by the same amount

Question 6

Measurement Uncertainty?

Answer 6

The smallest uncertainty in measurement is taken as half the smallest interval the measuring instrument can measure

Question 7

Resolution?

Answer 7

Smallest change in what is being measured that can be detected by the equipment

Question 8

Uncertainty in adding or subtracting values?

Answer 8

The uncertainty is considered by adding the absolute uncertainties of the values that are being added together

Question 9

Uncertainty in multiplying or dividing values?

Answer 9

The uncertainty is considered by adding the percentage uncertainties together

Question 10

Uncertainty in a value to a power?

Answer 10

Multiply the percentage uncertainty of the particular value by the power the value has

Question 11

Percentage Uncertainty in gradient?

Answer 11

( (Best Fit Gradient - Worst Fit Gradient) / Best Fit Gradient ) x100

Question 12

Line of worst fit?

Answer 12

Gradient from lowest point of one error bar to highest of another or gradient from highest point to lowest point

Question 13

Accurate?

Answer 13

Very close to the true value