A bank officer wishes to study how many customers write bad checks.To accomplish this,the officer randomly selects a weekly sample of 100 checking accounts and records the number that wrote bad checks.The numbers of customers who wrote bad checks in 20 consecutive weekly samples of 100 cardholders are,respectively,1,4,9,0,4,6,0,3,8,5,3,5,2,9,4,4,3,6,4,and 0.Find the appropriate center line.
A).08
B).01
C).09
D).04

Question

Quizplus · Accepted Answer

To find the center line for this chart, we need to calculate the average (mean) of the 20 consecutive weekly samples.

Average = (1+4+9+0+4+6+0+3+8+5+3+5+2+9+4+4+3+6+4+0) / 20 = 3.8

The center line is the average of the sample means, which is equal to the overall average.

Therefore, the center line is 0.038 or 0.04.

Option D) 0.04 is the best choice as it matches with the calculated center line.

A Bank Officer Wishes to Study How Many Customers Write