B.1 Handling data

Use an appropriate number of significant figures and report calculated results consistently with the precision of the raw data and the least accurate measurement.

Use b.1.1—significant figures to connect the rule to the data and decision in the question.

This matters because b.1.1—significant figures determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.1.1—significant figures to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.1.1—Significant figures is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.

Calculate arithmetic and weighted means, including relative atomic mass from isotopic abundances, and select concordant titration data after identifying outliers.

Use b.1.2—arithmetic and weighted means to connect the rule to the data and decision in the question.

This matters because b.1.2—arithmetic and weighted means determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.1.2—arithmetic and weighted means to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.1.2—Arithmetic and weighted means is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.

Identify measurement uncertainties and use simple techniques to determine uncertainty when data are combined, including uncertainty from two burette readings used to calculate a titre.

Use b.1.3—measurement uncertainty to connect the rule to the data and decision in the question.

This matters because b.1.3—measurement uncertainty determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.1.3—measurement uncertainty to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.1.3—Measurement uncertainty is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.