In an investigation, sample proportion is found as 0.42. There are 60 observations in this sample. If you want to find the 95% confidence interval for the population proportion, what is the values of zα/2 and standard error in the confidence interval f
zα/2 = z0.05/2 is what we are looking for, and the value of the z0.05/2 from the standard normal distribution table is 1.96. Now the standard error in the confidence interval formula is as follows:
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