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###### Problem 2 of tutorial 1:The tensile strength of Portland cement being studied Four different mixing techniques can be used economically. The following data have been collected:Mixing techniqueTensile strength3129 3200 2800 26003000 3300 2900 27002865 2975 2985 26002890 3150 3050 2765For the cotton weight percent example in Problem 2 of Tutorial suppose that the difference in tensile strength great enough such that the standard deviation has increased by 20 percent What sample size should be uscd

Problem 2 of tutorial 1: The tensile strength of Portland cement being studied Four different mixing techniques can be used economically. The following data have been collected: Mixing technique Tensile strength 3129 3200 2800 2600 3000 3300 2900 2700 2865 2975 2985 2600 2890 3150 3050 2765 For the cotton weight percent example in Problem 2 of Tutorial suppose that the difference in tensile strength great enough such that the standard deviation has increased by 20 percent What sample size should be uscd if we wish t0 detcct this difference with - probability of at least 0.90?

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