How do you find the mean and standard deviation of a
percentage? For example, the population with a history of CHD= 194.
the overall population sample is 4434.
The sample of men with history of CHD=124 with a percentage of
6.38.
The sample of women with history of CHD= 70 with a percentage of
2.81.
a) The mean of the percentage or a proportion is equal to the sample proportion which is computed here as:
The standard deviation of a percentage is computed here as:
Therefore the required mean and standard deviation here are 0.0438 and 0.0031 respectively.
b) For men, we are given the percentage as 6.38%,
Therefore the mean here is computed as:
The standard deviation here is computed as:
c) Similarly for women, the mean and standard deviation here are computed as:
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