More days above 7.5% would be true even if the underlying trendline was going up anyway.
They really should plot the moving average and include a longer timeseries - plotting the trendline before and after would be trying to prove what they are trying to show, rather than trying to work out whether what they are trying to show (our fancy new design wasn't a complete waste of time) is actually true.
They really should plot the moving average and include a longer timeseries - plotting the trendline before and after would be trying to prove what they are trying to show, rather than trying to work out whether what they are trying to show (our fancy new design wasn't a complete waste of time) is actually true.