A researcher wants to explore the relationship between number of children someone has and the amount of sleep the parents get each night. What research design would the researcher use

When deciding on an apartment what should you do first?

Does increased security engender feelings of increased safety or does it increase the fears that people have?

Black death spread because of what problem in medieval europe? which one is it i need the answer quick . a- overcrowded cities b-too many farm animals c-not enough qualified doctors d-all of the above