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The area under the normal curve drawn with regard to the population

The area under the normal curve drawn with regard to the population

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The area under the normal table will denote the characteristics of the normal population.

one can interpret the value of the standard deviation by reference to the normal curve. If a variable is distributed normally, then approximately two thirds of the population will lie (i.e., have scores) within plus or minus one standard deviation of the mean; about 95 percent will be within plus or minus 2 standard deviations of the mean. To see what this mean use MINITAB to calculate the mean and standard deviation of a normally distributed variable (use the stem command to see if the variable approximates a normal distribution). Then add and subtract 1 standard deviation to the mean. About two thirds of the cases should lie between these numbers.

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