Question 10: Suppose there are 10 students in your class You want to select three out of them - Economics - Collection of Data

Question

Question 10:
Suppose there are 10 students in your class You want to select
three out of them How many samples are possible?
Answer:
Population = 10
No of possible samples are 30 (=10 × 3)
This answer is wrong please corelate your answers

Prabhat Agrawal · Accepted Answer

total number of students 10
3 has to be selected out of 10
we can select any combination of 3 students out of 10
formula for combination is
Crn=n ιn-r ι*r ι, where n ι=n*n-1*n-2*n-3*
n is the total number of observations and r is the number of
observations which is to be selected
here, n = 10

r = 3
C310= 10 ι 10-3 ι*3 ι=10*9*8*7ι7ι*3 ι=10*9*83*2*1=120 ways

Question 10:Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?Answer:Population = 10 No. of possible samples are 30 (=10 × 3) This answer is wrong... please corelate your answers

Question 10:
Suppose there are 10 students in your class. You want to select three out of them. How many samples are possible?
Answer:
Population = 10

No. of possible samples are 30 (=10 × 3)

This answer is wrong... please corelate your answers