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Question 4. Two different methods of identifying an additive compound in steel were compared by taking 30 different steel samples. Each steel sample was cut in two and each half was analysed by the two methods. The results are presented in coded units in Table 2. Find if there is any significant difference between the two methods, using an appropriate level of significance. Method 1 21.2 23.2 20.5 22.3 18.7 19.5 19.8 21.7 24.6 20.3 24.8 22.2 21.8 20.7 19.3 22.1 24.3 18.6 20.6 22.7 21.3 19.2 18.9 23.5 21.4 19.8 22.3 25.6 21.7 20.6 Method 2 23.1 22.8 21.2 23.4 19.1 21.1 20.7 22.7 22.8 21.3 22.8 24.6 22.9 21.5 20.7 Table 2. 21.9 23.8 23.7 22.7 24.2 22.8 20.2 17.8 21.4 20.7 20.2 24.5 24.6 23.1 23.6 Comment on your results including, if applicable, any recommendations.
Question 4. Two different methods of identifying an additive compound in steel were compared by taking 30 different steel samples. Each steel sample was cut in two and each half was analysed by the two methods. The results are presented in coded units in Table 2. Find if there is any significant difference between the two methods, using an appropriate level of significance. Method 1 21.2 23.2 20.5 22.3 18.7 19.5 19.8 21.7 24.6 20.3 24.8 22.2 21.8 20.7 19.3 22.1 24.3 18.6 20.6 22.7 21.3 19.2 18.9 23.5 21.4 19.8 22.3 25.6 21.7 20.6 Method 2 23.1 22.8 21.2 23.4 19.1 21.1 20.7 22.7 22.8 21.3 22.8 24.6 22.9 21.5 20.7 Table 2. 21.9 23.8 23.7 22.7 24.2 22.8 20.2 17.8 21.4 20.7 20.2 24.5 24.6 23.1 23.6 Comment on your results including, if applicable, any recommendations.