A sociologist wishes to estimate the percentage of the United States population living in poverty. What size sample should be obtained if she wishes the estimate the population proportion to be within 2 percentage points with 90% confidence, a) If she uses 1999 estimate of 11.8% obtained from the Current Population Survey. b) She does not use any estimate.

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit