SOLUTION: there are 1000 students in the school of Engineering and Natural resources out of 20,000 in the whole coppebelt University. In the study 200 were found to

Question 1166257: there are 1000 students in the school of Engineering and Natural resources out of 20,000 in the whole coppebelt University. In the study 200 were found to be smokers in the school and 1000 in the whole university. Is there a statistical significant difference between the proportions of smokers in the school and the university
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
this is a 2 sample proportion
p1=0.2
p2=0.05
z=(p1-p2)/sqrt ((phat ((1/n1)+(1/n2))
=0.15/sqrt ((phat)*(1/1000+(1/20000)), where phat is the pooled proportion of 0.057.
z=19.4
This is highly significant, not surprisingly, given the large sample size and the large difference in proportions.

RELATED QUESTIONS
53%of the 1000 students a Barrett high are girls how many boys are there in the... (answered by josmiceli)

The classes in a primary school have 20 students to the nearest 10. There are 7 classes (answered by ikleyn)

HI! I need your help to solve this word problem. I have a lot of trouble understanding... (answered by richwmiller,Alan3354)

The dean at Brookfield College found that 20% of the female students are majoring in... (answered by stanbon)

in a school the students ratio of boys : girls is 3:5 there are 450 boys. work out the... (answered by lenny460)

In a school there are 800 students and 70 teachers. 10% of the students are left... (answered by MathLover1)

3 out of 8 students are members of the science club. If there are 560 students in the... (answered by ikleyn)

Write a proportion for the following problem and solve. In one particular Algebra class (answered by josgarithmetic,MathTherapy)

At a certain college, 55% of the students are female, and 21% of the students major in... (answered by Edwin McCravy)