700 14 14-1 Control Charts for Variation and Mean 14-2 Control Charts for Attributes Global Warming: Is It Real? STATISTICAL PROCESS CONTROL The principles of statistical process control are widely used to monitor the quality of services and manufactured goods. Scientists also use statistical process control in the monitoring of global temperatures to better understand and predict atmospheric and climatic changes. In this Chapter Problem, we consider the process of monitoring the surface temperature of Earth. Table 14-1 lists the global mean surface temperature (in °C) of Earth for each year from 1880, with projections used for the last two years. This data set is based on measurements provided by NASA Goddard’s Global Surface Temperature Analysis (GISTEMP). Note: Annual global temperature is calculated by comparing each daily measurement to what is “normal” for that specific location and time. For the GISS analysis, “normal” is defined as the mean temperature for the 30-year period 1951–1980. The differences are called “anomalies,” and it CHAPTER PROBLEM
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