Which of the follows describes Barack Obama’s foreign-policy style?

What is the estimated number of homeless people (including children) in Texas?

A) 5,000 - 8,000 B) 15,000 - 20,000 C) 20,000 - 30,000 D) 50,000 - 80,000

The _____ is used to compare a sample mean to a population mean to determine how many standard errors away from the mean the sample is.

a. z-score b. t-score c. variance d. Sum of Squares