A recent study investigated the variables that can be used to predict economic growth in China, as measured by gross domestic product (GDP, y, in hundred millions).36 A sample of years was obtained...

A recent study investigated the variables that can be used to predict economic growth in China, as measured by gross domestic product (GDP, y, in hundred millions).36 A sample of years was obtained and the following measurements were recorded: capital stock (x1, in hundred millions); labor force (x2, in ten thousands); and energy consumption (x3, in ten thousand tons standard coal).

A recent experiment was designed to determine whether the percentage of lactic acid