A medical test for pregnancy, which gives positive and negative responses for the same woman on the same day, is lacking

Preterm babies are considered at risk because ____________________________

a. their immune systems are immature b. they have too much surfactant in their lungs c. their bodies generate too much heat d. their gestational age is 40 weeks and that is still too early to perform basic functions, such as sucking

What test is used by researchers to evaluate homogeneity of variance?

A) Fmin test B) F est C) equality test D) post hoc test E) Fmax test