Using the standard Normal table

Using the standard Normal table - zscores.Thisallows ,...

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Using the standard Normal table The extra step in finding cumulative proportions from a table is that we must first  standardize to express the problem in the standard scale of  z -scores. This allows  us to get by with just one table, a table of  standard Normal cumulative  proportions.   Table A  in the back of the book gives cumulative proportions for the  standard Normal distribution . The pictures at the top of the table remind us  that the entries are cumulative proportions, areas under the curve to the left of a  value  z . EXAMPLE 3.6 The standard Normal table What proportion of observations on a standard Normal  variable   z  take values  less than 1.47? Solution:  To find the area to the left of 1.47, locate 1.4 in the left-hand column of  Table A , then locate the remaining digit 7 as .07 in the top row. The entry  opposite 1.4 and under .07 is 0.9292. This is the cumulative proportion we seek.  Figure       3.11      illustrates this area.

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This document was uploaded on 11/02/2011 for the course MATH ma 116 at Montgomery.

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Using the standard Normal table - zscores.Thisallows ,...

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