The estimate of β_1 for Heagle’s ozone data from Example 1.1 was β ̂_1 = -293.53 with a standard error of s(β ̂_1) = √11,620.281= 107.81. Thus, the computed t- value for the test H_0: β_1 =0 is
The estimate of β_1 for Heagle’s ozone data from Example 1.1 was β ̂_1 = -293.53 with a standard error of s(β ̂_1) = √11,620.281= 107.81. Thus, the computed t- value for the test H_0: β_1 =0 is