Question

quincy claims that if 80 coats are sold, the outside temperature is likely to be about 42°f. did quincy make a reliable prediction? if not, what was his mistake?
yes. quincys prediction is reliable.
no. quincy should have used the trend line to find the corresponding y value when x = 80.
no. quincy should have used the trend line to find the corresponding x value when y = 80.
no. the prediction is extrapolated, so it is too far off the graph to be reliable.

Explanation:

In a scatter - plot with a trend line, when making a prediction, we need to correctly identify the variables. Here, the \(y\) - axis is "Total Coat Sales" and the \(x\) - axis is "Average Temperature (\(^{\circ}F\))". If we know the number of coats sold (\(y = 80\)), we should use the trend line to find the corresponding \(x\) (temperature) value. Quincy made a mistake in variable identification.

Answer:

No. Quincy should have used the trend line to find the corresponding \(x\) value when \(y = 80\).