The melting points of two alloys used in formulating solder were investigated by melting

16 samples of each material. The sample mean for alloy 1 was 423.08 (F), and for alloy 2 was 424.7 (F). The sample average of the difference in melting point ED = 423.08 - 424.7 = -1.62, and the sample standard deviation of the difference in melting point was sD = 2.8 ( F). 1. Is there sufficient evidence to conclude that two alloys have the same mean (or the difference is zero)? Use a = 0.01. 2. Find a 99% two-sided CI on the difference in mean melting points of two alloys