13-3. The compressive strength of concrete is being studied, and four different mixing
Chapter 13, Problem 13-3(choose chapter or problem)
13-3. The compressive strength of concrete is being studied, and four different mixing techniques are being investigated. The following data have been collected. (a) Test the hypothesis that mixing techniques affect the strength of the concrete. Use 0.05. (b) Find the P-value for the F-statistic computed in part (a). (c) Analyze the residuals from this experiment. 13-4. An experiment was run to determine whether four specific firing temperatures affect the density of a certain type of brick. The experiment led to the following data.
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