Question 662459
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Hi,
certainly can understand Your diligence...
{{{1-.01/2 = .995}}}translating .995 to a z-value gives 2.58
Table 4B: 
  a.....0.25...0.20...0.10...0.05...0.02...0.01  Percents listed as decimals
z(a/2)..1.15...1.28..1.65...1.96...2.33...{{{highlight(2.58)}}}
 1-a....0.75...0.80..0.90...0.95...0.98...0.99   Percents listed as decimals
 1-a/2....0.875...0.90..0.95...0.975...0.99...0.995 and NORMSDIST(.995) = 2.58