A scrap-book of elementary mathematics; notes, recreations, essays (1908)
White, William Frank, 1871- · Chicago, The Open Court Pub. Co · leaf 166
es, and their distribution curves are more or less irregular; but under favorable con- ditions they frequently approximate this, which may be called the normal, "the normal probability integral." In these cases the tables that have been computed for this surface are of great assistance. 2. Every… … probability varies as the square root of the number of measures. E. g., If in one investigation 64 cases were measured, and in another 25 cases, the returns from the first investigation will be more trustworthy than those from the second in the ratio of 8 to 5. It is also apparent that, if the…
Mathematical recreations
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
