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

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1. 33. House Price Index

   1. Very similar, with increasing oscillating differences in later years.

   2. Strong annual cycle with increasing magnitude.

   3. Very similar(r² = 0.9998)

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2. 35. Arctic Ice

   1. r² = 0.7454, s_e = 0.5588, n = 37; b₁ is annual rate of reduction.

      Term	Estimate	Std Error	t Stat	p−value
      Intercept	14.7632	0.8397	17.58	< .0001
      Year	− 0.0871	0.0086	− 10.12	< .0001

   2. R² = 0.7833, s_e = 0.5231; higher rate in later years (rate is b₁+2 b₂ Year)

      Term	Estimate	Std Error	t Stat	p−value	VIF
      Intercept	− 4.3747	7.8872	− 0.55	0.5828	—
      Year	0.3123	0.1640	1.90	0.0653	414.6
      Year2	− 0.00206	0.00084	− 2.44	0.0201	414.6

   3. Both slope estimates are statistically significant because of less collinearity.

      Term	Estimate	Std Error ...