Trend

A trend lets you predict the property of an element even when its value has not been supplied. First identify where the element lies in the group, then state the trend and apply it in the correct direction.

A smooth line or curve through continuous data helps you see the overall trend. You can estimate a value between plotted readings, but a prediction beyond the measured range is less secure. A point far from the general pattern may be anomalous; notice it rather than changing or silently discarding the recorded value.

A line of best fit helps reveal the overall trend when measured points do not fall perfectly on a smooth line. A point well away from that trend is anomalous; it should be checked or explained rather than silently discarded. A steep section of a graph means a large change in the vertical quantity for a small change in the horizontal quantity.

A strong interpretation begins with the overall trend. State whether the variable generally increases, decreases, remains approximately stable or fluctuates without a clear direction. Support that statement with values from suitable points, usually near the beginning and end of the period.