![]() To add a regression line, choose "Add Chart Element" from the "Chart Design" menu. We can chart a regression in Excel by highlighting the data and charting it as a scatter plot. The time period under study may not be representative of other time periods.The data is a time series, so there could also be autocorrelation.There are only 20 observations, which may not be enough to make a good inference.Visa is a component of the S&P 500, so there could be a co-correlation between the variables here. ![]()
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