Statistics for Business: Decision Making and Analysis, 3rd Edition

You Do It

1. 41.

   1. Source	DF	Sum of Squares	Mean Square	F	p−value
      Regression	3	150	50.000	3.5	0.0212
      Residual	56	800	14.286
      Total	59	950

   2. The null hypothesis states no preference, H₀: μ₁ = μ₂ = μ₃ = μ₄.

   3. Yes.

   4. A statistically significant difference occurs; however, without the means, we cannot tell which is preferred.

2. 43.

   1. To compare ₅₁C₂ = 1275 pairs, α = 0.05/1275 ≈ .0000392. The appropriate t−percentile is t ≈ 4.13. The difference between two sample averages must be at least

      $$4.13\times s_e\sqrt{2/20}\approx \$4.571$$

   2. No, not unless there is some suspicion that some state is out of line.

3. 45.

   1. The scale on the x−axis. The x−axis in the plot of Y on D goes from 0 to 1, whereas it goes from − 1 to 1 in the plot of Y on X.

   2. Yes

   3. Sample means are the fitted ...