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A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18. Find the control limits for the xbar chart.
Suggested Answer: B
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34 comments · newest first
GL
Glenn
11 months ago
The mean of ranges is 0.18, just a quick fact!
SH
Shawna
11 months ago
Totally agree with option C! Makes sense.
HE
Henriette
11 months ago
Wait, how can the limits be that close? Seems off.
BA
Basilia
11 months ago
I think the control limits are around 12.54 and 12.70.
TU
Tuyet
11 months ago
Mean of sample means is 12.62, got it.
AN
Annamae
12 months ago
I’m leaning towards option C, but I’m not entirely confident. I remember the control limits should be around the mean, but I need to double-check my calculations.
LA
Laquanda
12 months ago
I’m a bit confused about how to apply the range here. I think we might need to use a factor to adjust the limits, but I can’t recall which one.
RE
Reena
12 months ago
I think we used a similar question in practice where we had to find control limits. I feel like the limits should be close to the mean of 12.62.
JI
Jillian
1 year ago
I remember we calculated control limits using the mean and range, but I'm not sure about the exact formulas for this scenario.
RE
Reena
1 year ago
Ugh, I'm so confused by this question. I don't even know where to start. I guess I'll just try to remember the steps we learned and see if I can figure it out. Wish me luck!
RO
Roslyn
1 year ago
I've got this! We just need to plug the given values into the right formulas. I remember learning how to do this in class. Let me think... Okay, I think the answer is C. 12.54 and 12.70 should be the control limits.
FL
Floyd
1 year ago
Okay, let's think this through step-by-step. We have 50 samples with 8 readings each, and the mean of the sample means is 12.62 and the mean of the ranges is 0.18. I think we need to use those values to calculate the control limits for the xbar chart.
NO
Norah
1 year ago
Hmm, this looks tricky. I'm not totally sure how to approach this, but I'll give it a try. I think we need to use some kind of formula to calculate the control limits, but I'm not sure which one to use.
NA
Naomi
1 year ago
I've seen questions like this before. I think the key is to focus on agencies that deal with employment and labor laws, since the question mentions "company records." I'll start there and see if I can eliminate some options.
CI
Ciara
1 year ago
I'm not sure about this one. The question seems to be asking about the specific business unit that can use the Contact Delete feature, but I'm not familiar with the details of Enterprise 2.0 accounts.
OL
Olga
1 year ago
A or C, definitely. I can't imagine the control limits being as wide as 12.11 to 13.13. That's like a whole point of variation!
AS
Asha
1 year ago
Hmm, I'm leaning towards B. The range data seems important, and that answer looks like it takes that into account.
FE
Felicidad
1 year ago
I'm not so sure, I think it might be C) 12.54 and 12.70.
MA
Maurine
1 year ago
I agree, the range data is crucial in determining the control limits.
HA
Halina
1 year ago
I think the correct answer is A) 12.55 and 12.69.
ME
Meghann
1 year ago
Wow, this question is really testing our understanding of statistical process control! I think the answer is C, but I'm not 100% sure.
GW
Gwen
1 year ago
User4: I'm not sure, but I think it's between A and C
NI
Nickolas
1 year ago
User3: I'm leaning towards B) 12.11 and 13.13
JE
Jettie
1 year ago
User2: I believe it might be C) 12.54 and 12.70
BA
Basilia
1 year ago
Let's go with C then, it seems like the most likely option.
CH
Charolette
1 year ago
I calculated it and got the same result, C is correct.
OL
Oliva
1 year ago
I agree, I also think the answer is C.
LA
Lashon
1 year ago
User1: I think the answer is A) 12.55 and 12.69
RE
Reed
1 year ago
I'm not sure about the answer, but I think it makes sense to calculate the control limits based on the range and mean of sample means. I would go with A) as well.
LI
Linette
1 year ago
I agree with Ashton, the rationale behind it is that the control limits for xbar chart are calculated by adding and subtracting 3 times the range from the mean of sample means.
AS
Ashton
1 year ago
I think the answer is A) 12.55 and 12.69.
CA
Candida
1 year ago
I'm not sure about the answer, but I think we need to consider the formula for calculating control limits and make sure we apply it correctly.
ST
Stanton
1 year ago
I agree with Fletcher, the rationale behind it is that the control limits for an xbar chart are calculated by adding and subtracting 3 times the average range from the average of the sample means.
FL
Fletcher
2 years ago
I think the answer is A) 12.55 and 12.69.