Measurement YBTC #3

What is the difference between accuracy and precision?

• Accuracy refers to consistency; precision refers to closeness to true value.

• Accuracy refers to closeness to true value; precision refers to consistency.

• Accuracy and precision are the same.

• Accuracy refers to the number of measurements taken; precision refers to their range.

In a dartboard scenario, what indicates high precision but low accuracy?

• Darts land far apart but close to the bullseye.

• Darts land close together but far from the bullseye.

• Darts land randomly all over the board.

• Darts land directly on the bullseye.

A scientist measures the boiling point of water and gets: 99.5, 99.7, 99.6, 99.4, 99.8 °C.

What can be said about these measurements?

• High accuracy, low precision.

• High precision, low accuracy.

• Both high accuracy and precision.

• Low accuracy and precision.

Why is it important to understand both accuracy and precision in scientific experiments?

• It is not important; only accuracy matters.

• High precision guarantees accuracy.

• Understanding both ensures reliable results; neglecting either can lead to incorrect conclusions.

• Only precision affects public health.

What are significant figures?

• The numbers that are always zero in a measurement.

• The digits in a number that contribute to its precision.

• The total number of digits in a measurement.

• Only the whole numbers in a measurement.

Put the following steps in order.

To find significant figures:

• Start with the first non-zero digit. This is your first significant figure.

• Zeros between non-zero digits are significant.

• The next digit is the second significant figure, and so on.

• Trailing zeros (zeros at the end) are significant only if there’s a decimal point.

Scientists use significant figures to show how accurate a measurement is.

Each digit in a number, starting from the first non-____ digit, is important for this accuracy.

How many significant figures are in the number 0.00456?

• 2

• 3

• 4

• 5

In the number 1500.0, how many significant figures are present?

• 2

• 3

• 4

• 5

Which of the following numbers has the least significant figures?

• 0.03040

• 300

• 25.000

• 0.0040