A health plan wishes to estimate the mean number of visits per plan participant in a year. How large a sample of participant records should be selected in order to estimate this mean with an accuracy of 0.25 visits with probability 0.9? A similar study at a similar organization at the other end of the state suggests that the standard deviation of the number of visits per person is approximately 2.1.
Sample Size for 90% CI, E = 0.25 and ? = 2.1
Confidence level = 90% and Desired Margin of Error, E = 0.25.
Minimum sample size is given by:
x ? ?| < E) ? 1 ? ? ? P...
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