To test for normality, an ogive of a set of data can be drawn on probability paper. An ogive is a line graph of a cumulative frequency or cumulative relative frequency distribution. Note the probability plot below. Probability Plot Normal 99 95 90 80 10 5 15 20 10 Data values If the ordered pair points (data value, cumulative probability) follow fairly closely to the sketched straight line, the set of data can be considered approximately normally distributed. Part 1 of 3 Note how the vertical scale on the probability plot is not uniform. How does that correspond to a normal distribution? Percent 30 20 T I

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