Hi everyone,
Looking at the attached text notes outlining confidence intervals, and how to construct confidence intervals for:
Or is this formula (6.3 in the image) just to demonstrate that the standard deviation of the sampling distribution of proportions is based on what the value of the population proportion is, and so we use the sample proportion as our best estimate (formula 6.4)?
Ultimately, I'm just confused on when formula 6.3 would ever be used  if we're trying to estimate the population proportion, and we already *know* the population proportion, why are we trying to estimate it? Why does it say to use this formula when the population proportion is known?
Thanks,
Frodo
Looking at the attached text notes outlining confidence intervals, and how to construct confidence intervals for:
 A sample mean (when the population standard deviation is known)
 A sample mean (when the population standard deviation is unknown)
 A sample proportion (when the population proportion is known)
 A sample proportion (when the population proportion is unknown)
Or is this formula (6.3 in the image) just to demonstrate that the standard deviation of the sampling distribution of proportions is based on what the value of the population proportion is, and so we use the sample proportion as our best estimate (formula 6.4)?
Ultimately, I'm just confused on when formula 6.3 would ever be used  if we're trying to estimate the population proportion, and we already *know* the population proportion, why are we trying to estimate it? Why does it say to use this formula when the population proportion is known?
Thanks,
Frodo
Attachments

234.7 KB Views: 2

167.9 KB Views: 1

111.3 KB Views: 2