You are conducting a study on the blood glucose levels of 9 patients who are on strict diets and exercise routines.To monitor the mean and range of the blood glucose levels of your patients,you take a blood glucose reading every day for each patient for 20 days.The mean of the 9 sample means is 101.03,and the mean of the 9 standard deviations is 29.243.The lower control limit for your chart is ________.
A)70.85
B)92.11
C)73
D)71.75
E)60.5

Question

You are conducting a study on the blood glucose levels of 9 patients who are on strict diets and exercise routines.To monitor the mean and range of the blood glucose levels of your patients,you take a blood glucose reading every day for each patient for 20 days.The mean of the 9 sample means is 101.03,and the mean of the 9 standard deviations is 29.243.The lower control limit for your  chart is ________.
A)70.85 
B)92.11 
C)73 
D)71.75 
E)60.5

Quizplus · Accepted Answer

The lower control limit (LCL) for an X-bar chart is calculated as X-bar - 3s/sqrt(n), where X-bar is the mean of the sample means (101.03), s is the mean of the sample standard deviations (29.243), and n is the sample size (20). Plugging in these values, we get LCL = 101.03 - 3(29.243/sqrt(20)) = 70.85. Therefore, the correct answer is A.

You Are Conducting a Study on the Blood Glucose Levels