Question: Several water samples were taken from three wells at various times, and the pH was measured for each sample, with the following results. Given

Several water samples were taken from three wells at various times, and

Several water samples were taken from three wells at various times, and the pH was measured for each sample, with the following results. Given are the sample means, the sample standard deviations, and the sample sizes. Well 1 Mean SD Sample Size 6.0 0.2 49. 2 3 (a) Write the means model for these data. State the null hypothesis. Give point estimates of the parameters in the means model. 6.2 0.4 31 6.4 0.6 30 (b) Write the main effects model for these data. State the null hypothesis. Give point estimates of the parameters in the main effects model.

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