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formula for sample size and margin of error. I calculate the margin of error and confidence interval using three differ. The z-score is the number of standard deviations a given proportion is away from the mean.
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If you have a small to moderate population and know all of the key values you should use the standard formula. Z c 100 2r 100- r n. - its a random sampling technique formula to estimate sampling size -It is computed as n N 1Ne2.
According to this data you conclude with 95 confidence that 52 of all Americans approve of the president plus or minus 31.
The formula for the margin of error is calculated by multiplying a critical factor for a certain confidence level with the population standard deviation and then the result is divided by the square root of the number of observations in the sample. N population size e Margin of error percentage in decimal form z z-score. This gives us the formula n za2 s E 2. 0 5 0.
