The weight percent of silicon in six different rock samples, each containing different amounts of silicon, was measured by two different methods. The results are given in the table. Sample| Method A Si wt% Method B Si wt% 1.570 11.550 2 15.380 15.330 3 17.950 17.890 4 22.840 22.830 5 25.110 25.180 6 27.070 27.010 Determine calc. calc = Determine ttable at the 95% confidence level. A list of t values can be found in the Student's t table. ttable = Are these methods significantly different at the 95% confidence level? The methods are not significantly different at the 95% confidence level. The methods are significantly different at the 95% confidence level