If 20 samples of size 7 are drawn,with = 33.33 and = 5.65,what is the A-B upper boundary for the chart?
A)35.697
B)34.908
C)34.347
D)34.008

Question

If 20 samples of size 7 are drawn,with  = 33.33 and  = 5.65,what is the A-B upper boundary for the  chart?
A)35.697 
B)34.908 
C)34.347 
D)34.008

Quizplus · Accepted Answer

The A-B upper boundary can be calculated using the formula:
A-B upper boundary = AVERAGE of the sample means + 3 * standard deviation of the sample means

The average of the sample means can be calculated as (11eb06d7_5569_4647_8177_9547623a7f04_TB1736_11) = 33.33.

The standard deviation of the sample means can be calculated as:
standard deviation = (11eb06d7_5569_4648_8177_1b9be2572909_TB1736_11) / sqrt(sample size) = 5.65 / sqrt(7) = 2.13

Therefore, the A-B upper boundary = 33.33 + 3 * 2.13 = 34.908, which corresponds to choice B.

If 20 Samples of Size 7 Are Drawn,with =