assuming  an  approximately  normal  data  set,  find  the  99.7%  confidence  interval  for  systolic  blood  pressure  in  women given  a  sample  size  of  1000  with  a  mean  of  123.4  and  a  standard  deviation  of  19.9.  1.73.65  –  173.15 3.103.5  –  143.3 2.63.7  –  183.1 4.83.6  –  163.2

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.