In: Statistics and Probability
The following is a list of the first names of 24 fictional
students in a statistics class at Cleveland State University. The
students are identified by numbering them 01 through 24.
A sample of six students is to be selected by using systematic
sampling. The first student to be selected is the one with ID 03.
Choose the six students that will be included in the sample.
ID | Student | ID | Student |
01 | Ali | 13 | Sakiya |
02 | Pedro | 14 | Mary |
03 | Alicia | 15 | Ethan |
04 | Jalil | 16 | Nathan |
05 | Tonika | 17 | Patricia |
06 | Charles | 18 | Chung |
07 | Everlyn | 19 | Sally |
08 | Saul | 20 | Clarence |
09 | Sarah | 21 | Susie |
10 | Leroy | 22 | Mohammed |
11 | Joan | 23 | Maria |
12 | Raul | 24 | Sajida |
Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point but with a fixed, periodic interval. This interval, called the sampling interval, is calculated by dividing the population size by the desired sample size.
here population size = 24
desired sample size = 6
for interval calculation,
interval = 24 / 6 = 4
random starting point is 3 and from interval we can easily obtain six students that will be included in the sample.
3+4 = 7
7+4 = 11
11+4 =15
15+4 = 19
19+4 = 23
hence six students that will be included in the sample who have ID 3,7,11,15,19,23
ID | Student | ID | Student |
01 | Ali | 13 | Sakiya |
02 | Pedro | 14 | Mary |
03 | Alicia | 15 | Ethan |
04 | Jalil | 16 | Nathan |
05 | Tonika | 17 | Patricia |
06 | Charles | 18 | Chung |
07 | Everlyn | 19 | Sally |
08 | Saul | 20 | Clarence |
09 | Sarah | 21 | Susie |
10 | Leroy | 22 | Mohammed |
11 | Joan | 23 | Maria |
12 | Raul | 24 | Sajida |
03 | Alicia |
07 | Everlyn |
11 | Joan |
15 | Ethan |
19 | Sally |
23 | Maria |
these are six students that will be included in the sample.