What percentage of young people obtained tertiary education in any developed country 100 years ago?

The vagina develops from the same embryonic tissue as the penis

a. True b. False

The null hypothesis for a t test states that all differences between the groups

A) are due to extraneous variables and therefore the difference is significant B) are due to random assignment and therefore are not significant C) are due to chance, not the operation of the IV D) are due to the operation of the IV, and not chance