The following data are the viscosity measurements for a chemical product observed hourly (read down, then left to right). Construct and interpret either a digidot plot or a separate stem-and-leaf and time series plot of these data. Specifications on product viscosity are at 48 ± 2. What conclusions can you make about process performance?

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43.2 43.6 43.2 43.5 43.0 47.9 47.9 48.6 48.8 48.1 48.0 48.3 43.2 43.0 43.5 43.1 48.0 47.5 48.6 48.0 47.9 48.3 48.5 43.0 42.9 43.6 43.3 48.6 48.1 48.0 48.3 47.2 48.9 48.6 48.4 48.1 48.0 43.0 42.8 43.1