Please help me. I'm stuck

This is about ANOVA

3-1 The tensile strength of portland cement is being studied. Four different mixing techniques can be used economically. The following data have been collected: Mixing Technique Tensile Strength (Ib/in.?) 3129 3000 2865 2890 3200 3300 2975 AWN - 3150 2800 2900 2985 3050 2600 2700 2600 2765 (a) Test the hypothesis that mixing techniques affect the strength of the cement. Use a = .05. (b) Use Duncan's multiple range test to make comparisons between pairs of means. 3-2 A textile mill has a large number of looms. Each loom is supposed to provide the same output of cloth per minute. To investigate this assumption, five looms are chosen at random and their output is noted at different times. The following data are obtained: Loom Output (Ib/min) 14.0 14.1 14.2 14.0 14.1 13.9 13.8 13.9 14.0 14.0 UIA WN - 14.1 14.2 14.1 14.0 13.9 13.6 13.8 14.0 13.9 13.7 13.8 13.6 13.9 13.8 14.0 (a) Explain why this is a random effects experiment. Are the looms equal in output? (b) Estimate the variability between looms. (c) Estimate the experimental error variance. (d) Find a 95 percent confidence interval for a? /(o? + ?)