business statistics
posted by Josephine
Samples of 12volt batteries are taken at 30minute intervals during a production run. Each sample consists of three batteries, and a technician records how long each battery will produce 400 amperes during a standard test. Given the following data, also listed in file XR20042, construct 3sigma mean, range control charts, and evaluate whether the process is in control.
Sample Battery1 Battery2 Battery3
1 13.3 9.4 12.1
2 12.2 13.4 8.5
3 11.2 8.2 9.2
4 7.8 9.7 10.0
5 10.1 11.4 13.8
6 9.9 11.7 8.5
Minutes
13.3
9.4
12.1
12.2
13.4
8.5
11.2
8.2
9.2
7.8
9.7
10.0
10.1
11.4
13.8
9.9
11.7
8.5
Please I need help, can you give the step to do this exercises.
Thank you very much.

economyst
As you can see, cutting and pasting does not work so well on the jiskha site. Sorry.
Respond to this Question
Similar Questions

Science
I did a science experiment on batteries. I ran five brands of AA Alkaline batteries until they would no longer run a small light bulb. I measured the voltage of each battery every hour. I did this experiment four times using the same … 
Circuits Problem (Physics)
h t t p ://img266.imageshack.us/my.php?image=circuit2ru6.png Given the circuit above: a) Solve for unknown currents. b) What is the potential difference between points a and b? 
business statistics
Please can you give me the step to do this exercise? 
Statistics
. A certain company makes 12volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 45 months and a standard deviation of 7 months. If the … 
Statistics
A certain company makes 12volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 45 months and a standard deviation of 7 months. If the … 
Statistics
the manufacturer of a certain brand of auto batteries claims the mean life of these batteries is 45 months. A consumer protection agency that wants to check this claim took a random sample of 36 such batteries and found the mean life … 
Statistics
A battery manufacturer is positive that its AA batteries last for 1,000 hours. However, you’re working for Consumer Reports and you don’t agree with what they say about their product. So, you buy 400 batteries and you test them … 
statistics
The Acme Company has developed a new battery. The engineer in charge claims that the new battery will operate continuously for at leas 7 minutes longer than the old battery. To test the claim, the company selects a simple random sample … 
Sampling Distributions
A firm produces batteries that have a lifetime which is normally distributed with a mean of 360 minutes and a standard deviation of 30 minutes. The firm needs to keep an eye on the production process to ensure that everything is working … 
Data Analysis
A firm produces batteries that have a lifetime which is normally distributed with a mean of 360 minutes and a standard deviation of 30 minutes. The firm needs to keep an eye on the production process to ensure that everything is working …