External (informational) efficiency means that:

Empirical studies of mutual fund performance indicate that:

Which statement(s) regarding the selection of an appropriate sample size is/are false?
I). If the population is normally distributed, and the population variance is known, use a t-score irrespective of sample size.
II). If the population is normally distributed, and the population variance is unknown, use a z-score irrespective of sample size.
III). If the population is not normally distributed, and the population variance is known, use a F-score only if n >= 30, otherwise it cannot be done.
IV). If the population is not normally distributed, and the population variance is unknown, use a X2-score only if n >= 30, otherwise it cannot be done

You have a nest egg of $750. In order for your money to grow to $1,343.10, it must be invested at 6% for how many years?

The coefficient of variation is useful when:
I). The frequency distribution contains open-ended classes or overlapping classes.
II). The data sets being compared contain data in different measurement units.
III). The data sets being compared contain data with similar measurement units.