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Appendix . A: Guide io Sutistical Significance <br /> • <br /> 'kppendix A: Guide to Statistical <br /> • Significance <br /> The table below shows the possible sampling variation that applies to a percentage result <br /> reported from a probability type sample. If a sample of 400 residents isdraall from the adult <br /> • <br /> population of the City of San Leandro, one can he 95 percent confident that the maximum <br /> margin of error due to sampling will vary (plus or minus) between 2.93 percent and 4.88 <br /> percent, depending on the distribution of responses. The margin of error shows that the <br /> chances are 95 out of 100 that the results in the sample do not vary, plus or minus, by more <br /> than the indicated number of percentage points from the result that would have been <br /> obtained if the interviews had been conducted with everyadrelt resident in the City. <br /> • <br /> Table 1. Guide to Statistical Significance <br /> • Distribution of Responses <br /> N 90% / 10% 80% 120% 70% 130% 60% 140% 50 %'/ 50% <br /> 1000 1.84% 2.46% 2.82% 3.01% 3.07% <br /> 900 1.94% 2.59% 2.97% 3.18% 3.24% <br /> • <br /> 800 2.06% 2.75% 3.15% 3.37% 3.44% <br /> • 700 2.21% 2.94% 3.37% . 3.61% 3.68% <br /> 600 2.39% 3.18% 3.65% 3.90% 3.98% <br /> 500 2.62% 349% 4.00% 4.28% 4.36% <br /> rditfonfi t''F, 293% i X 3 91 %� 4 4x48% \ 778% F ' - l 4l88P:.4;i <br /> 300 3.39% 4.51% 5.17% 5.53% 5.64% <br /> 200 4.15% 5.53% 6.34% . 6.78% 6.92% <br /> 100 5.87% 7.83% 8.97% 9.59% 9.79% <br /> 50 8.31% 11.08% 12.70% : 13.57% 13.85% <br /> rl EN <br /> • <br /> � 0 City .9 /San Leandro <br /> CaJEr Research G Neal }sis <br /> Godbel¢eacl & Analysis Page 18 <br /> • <br />