Question

1. Please calculate the probable sample size applying the best fit sampling formula applicable to this context. Show the formula/values in use and provide rationale as to why should you use that particular formula



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Answer 1

The formula for determining sample size to ensure that the test has a specified power is given below: where α is the selected level of significance and Z 1-α /2 is the value from the standard normal distribution holding 1- α/2 below it. For example, if α=0.05, then 1- α/2 = 0.975 and Z=1.960.