Q$1.$ Four different mixing techniques are being examined for the compressive strength of concrete.

The following data have been collected.

$($a$)$ Test the hypothesis that mixing techniques affect the strength of the concrete. Use $\backslash$alpha $=0\mathrm{.}05.$

Use the formulations to find SS$,$ MSE, and F values.

$($b$)$ Analyze the residuals from this experiment. Put Computer outputs. Graphs and ANOVA

table.

$($c$)$ Use Fisher's LSD method with $\backslash$alpha $=0\mathrm{.}05$ test to analyze the means of the three flow rates.

MIXING TECHNIQUE $$ COMPRESSIVE STRENGTH $($psi$)$

$13129300028652890$

$23200330029753150$

$32800290029853050$

$42600270026002765$