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Question 29 3 pts We suspect that Method 1 for detecting impurities in iron ingots yields higher results than Method 2 for finding such impurities. We want to give a 90% confidence interval for the difference in the average number of impurities detected by the two methods. In order to obtain the confidence interval, we measured the impurities of 3 ingots, employing both methods for each ingot. The results are presented in the table below. We let My denote the population average number of defects for Method 1 and /2 denotes the population average number of defects for Method 2. We wish to develop a confidence interval for Ma = M1 - M2 Give the margin of error for the 90% confidence interval for Ma = M1 - M2 Ingot 1 Ingot 2 Ingot 3 Method 1 16 32 12 Method 2 12 26 10 O 1.84 O 2.26 O 1.90 O 3.37 O 4.97