Select all that are true about the confidence interval.

Question 1 options:

The margin of error is the smallest possible difference between sample mean and population mean.

A point estimate gives more information than an interval estimate.

A point estimate is the single best guess for the parameter while an interval estimate is range of plausible values for the parameter.

When everything else is same, increasing confidence level decreases the length of interval.

When everything else is same, increasing sample size reduces the length of interval.