3.9 The tensile strength of Portland cement is being studied. Four different mix- ing techniques can be used economically. A completely randomized experiment was conducted and the following data were collected: Mixing Technique Tensile Strength (Ib/in ²) 1 3129 3000 2865 2890 2 3200 3300 2975 3150 3 2800 2900 2985 3050 4 2600 2700 2600 2765 1 (a) Test the hypothesis that mixing techniques affect the strength of the cement. Use α 0.05. (c) Use the Fisher LSD method with a = 0.05 to make comparisons between pairs of means.

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3.9 The tensile strength of Portland cement is being studied. Four different mix-
ing techniques can be used economically. A completely randomized experiment
was conducted and the following data were collected:
Mixing Technique
Tensile Strength (Ib/in 2)
3000
3300
1
3129
2865
2890
2
3200
2975
3150
3
2800
2900
2985
3050
4
2600
2700
2600
2765
1
(a) Test the hypothesis that mixing techniques affect the strength of the cement.
Use a = 0.05.
(c) Use the Fisher LSD method with a = 0.05 to make comparisons between
pairs of means.
Transcribed Image Text:3.9 The tensile strength of Portland cement is being studied. Four different mix- ing techniques can be used economically. A completely randomized experiment was conducted and the following data were collected: Mixing Technique Tensile Strength (Ib/in 2) 3000 3300 1 3129 2865 2890 2 3200 2975 3150 3 2800 2900 2985 3050 4 2600 2700 2600 2765 1 (a) Test the hypothesis that mixing techniques affect the strength of the cement. Use a = 0.05. (c) Use the Fisher LSD method with a = 0.05 to make comparisons between pairs of means.
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