Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, = 15,350 and = 411.4. How many samples were collected?
A)4
B)25
C)100
D)20

Question

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples,  = 15,350 and  = 411.4. How many samples were collected?
A)4 
B)25 
C)100 
D)20

Quizplus · Accepted Answer

The problem states that after 25 samples, the two given measurements were taken. Therefore, we know that the measurements pertain to the 25th sample. We do not have information on how the characteristic varied across the other samples or if the measurements were taken at regular intervals. Thus, we cannot determine the total number of samples collected.

Random Samples of Four Items Are Selected from a Manufacturing