Researchers want to know if babies born in the US are longer than babies born in the world overall. They compare the length of babies at birth (in cm) in the US to all other countries that report data on infant length at birth.

What t-test should researchers use to determine if there are significant differences between the length of babies born in the UScompared to babies born throughout the world?

A. Within groups t-test

B. Critical value t-test

C. Independent groups t-test

D. Single sample t-test