Table 2. — Outline of computation of percentage movement and 



its confidence interval. (See text for explanation.) 



Monterey 



San Pedro 



19U7-U8 



E = 100.6 mm. 

 N = 100 



s 2 = 



L 



s 2 (C) 



19U7-W 



155.5 mm- 2 

 = 1.555 mm. 



L = 138.1 mm. 

 N = 281 



s 2 = 200.5 mm. 2 



Li 



s 2 (E) = 0.7135 mm. 2 



19W-B 



L = 129.9 mm. 

 N = 99 



,2 



338. h ram. 



s 2 (L) = 3.U18 mm. 2 



y = (130.1; - 138.6) = -8.2. mm change at San Pedro 



x = (100.1 - 138.6) = -37-5 mm immigrant difference 



P =1 



.22 



c£ = u.132 = 0.061 

 y TBT27 2 



c£ = 2.269 = 0.00161 



X r, 



(37.5) 2 



p ' = P/l + 1.96 J.Obl + .00161 - 3.8U (. 061 )(. 00161 T ■= 0.326 



U L l-3.8l(. 00161) 3 



p' = p^/ l-l.96 y/. 061 + .00161-3. 8U(.06l)(. 00161) ' =/ 0.117 

 1 U 1-3. OI4.C .00161) ~J 



Upper 95$ limit (100 P* ) 33$ 



Point estimate (100 P) 22$ 



Lower 95$ limit (100 P 1 ) 12$ 



34 



