The manager of an assembly line took five samples each with six observations, under ideal conditions...
- The manager of an assembly line took five samples each with six observations, under ideal conditions to develop control limits for an X-bar chart and R-chart. The mean and the range for each sample is shown in the table below.
Sample Number Sample Mean Sample Range
1 2.18 0.33
2 2.12 0.38
3 1.88 0.44
4 1.99 0.38
5 2.02 0.32
- Calculate the UCL and LCL for the X-bar Chart and the R-chart. (Use the chart on appendix B for the value of A2, page 398 in the book).
- Construct the X-bar chart and the R-chart. Please watch the example video for this chapter to construct these charts. I prefer to see the charts being drawn manually, by hand, instead of MS Excel because most students who used excel ended up submitting charts that didn’t look like control charts .
- What can you conclude about the assembly line process base on the two charts?
Homework Answers
Add Answer to:
The manager of an assembly line took five samples each with six
observations, under ideal conditions...
Computer upgrades have a nominal time of 80 minutes. Samples of five observations each have been ...
Computer upgrades have a nominal time of 80 minutes. Samples of five observations each have been taken, and the results are as listed. SAMPLE 1 2 3 4 5 6 79.2 80.5 79.6 78.9 80.5 79.7 78.8 78.7 79.6 79.4 79.6 80.6 80.0 81.0 80.4 79.7 80.4 80.5 78.4 80.4 80.3 79.4 80.8 80.0 81.0 80.1 80.8 80.6 78.8 81.1 Factors for three-sigma control limits for x¯ and R charts FACTORS FOR R CHARTS Number of Observations in Subgroup, n...
8 have been gathered with the following results A services process is monitored using x-bar and...
8 have been gathered with the following results A services process is monitored using x-bar and R charts. Eight samples of n5 observations Sample 2 4 Mean 7.2 7.4 6.6 6.8 7.9 6.0 7.2 6.2 Range .43 .52 .53 20 .36 .42 .35 .42 7 8 Using this data, compute the centerline, the 3 sd upper control limit, and the lower control limits for the x-bar and R charts X-bar R-bar UCL r-bar LCL r-bar UCL x-bar LCL x-bar a....
1st*variability is: in control/out of control 2nd*no samples fall/one/two/more 3rd* in control/out of control The following...
1st*variability is: in
control/out of control
2nd*no samples fall/one/two/more
3rd* in control/out of control
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five points in time during a manufacturing cycle. X Sample R 1 95.72 1.0 95.24 2 0.9 0.9 95.18 95.42 0.4 4 5 95.46 0.5 95.32 1.1 6 7 95.40 0.9 95.44 0.3 9 95.08 0.2 10 95.50 0.6 11 95.80 0.6 12...
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 w...
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 woofer sample is computed. The following data represent the summary statistics for the most recent 14 Sample Mean 6.49* 6.47 6.49 6.51 6.50 6.46 6.47 6.52 6.51 6.48 6.49 6.50 6.52 6.46 Range 0.05. 0.03 0.07 0.02 0.06 0.08 0.03 0.04 0.07 0.03 0.05 0.03* 0.04 2 6...
Checkout time at a supermarket is monitored using a mean and a range chart. Six samples...
Checkout time at a supermarket is monitored using a mean and a range chart. Six samples of n = 20 observations have been obtained and the sample means and ranges computed: Sample Mean Range Sample Mean Range 1 3.06 .42 4 3.13 .46 2 3.15 .49 5 3.06 .46 3 3.11 .41 6 3.09 .45 Factors for three-sigma control limits for x¯x¯ and R charts FACTORS FOR R CHARTS Number of Observations in Subgroup, n Factor for x¯x¯ Chart, A2 Lower...
The Money Pit Mortgage Company is interested in monitoring the performance of the mortgage process. Fifteen...
The
Money Pit Mortgage Company is interested in monitoring the
performance of the mortgage process. Fifteen samples of five
completed mortgage transactions each were taken during a period
when the process was believed to be in control. The times to
complete the transactions were measured. The means and ranges of
the mortgage process transaction times, measured in days, are as
follows:
b.
Sample123456789 10 11 12 13 14 15 Mean 5 103 7 8 13 14 9 9 9 5...
Problem 10-25 Resistors for electronic circuits are manufactured on a high-speed automated machin...
Problem 10-25 Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. Use Exhibit 10.13. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows: Use three-sigma control limits READINGS (IN OHMS) 1014 1019...
Question pertains to the x-chart part Sample Mean Range 16 8 12 13 6 6 4...
Question pertains to the
x-chart part
Sample Mean Range 16 8 12 13 6 6 4 15 10 10 11 10 16 13 14 0 14 17 11 12 IU 12 12 11 13 14 12 7 8 13 9 11 14 7 13 15 10 15 Subsequently, samples of size 5 were taken from the process every week for the next 10 weeks. The times were measured and the following results oblained: Sample Mean Range 16 9 17 12...
A lumber company makes plywood for residential and commercial construction. Every hour, five pieces of plywood...
A lumber company makes plywood for residential and commercial construction. Every hour, five pieces of plywood are selected and the thicknesses are measured. The accompanying graphs are the control charts for the first 20 subgroup Suppose this process remained in control for the next 40 hours. The accompanying data are the thickness measurements for hours 41 through 43. Based on these data and the two control charts, what should be concluded about the pro Has the process gone out of...
A teller at a drive-up window at a bank had the following service times (in minutes)...
A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: SAMPLE 1 2 3 4 4.5 4.6 4.5 4.7 4.2 4.5 4.6 4.6 4.2 4.4 4.4 4.8 4.3 4.7 4.4 4.5 4.3 4.3 4.6 4.9 a. Determine the mean of each sample. (Round your answers to 1 decimal place.) Sample Mean 1 2 3 4 b. If the process parameters are unknown, estimate its mean and standard deviation. (Round...
8 have been gathered with the following results A services process is monitored using x-bar and R charts. Eight samples of n5 observations Sample 2 4 Mean 7.2 7.4 6.6 6.8 7.9 6.0 7.2 6.2 Range .43 .52 .53 20 .36 .42 .35 .42 7 8 Using this data, compute the centerline, the 3 sd upper control limit, and the lower control limits for the x-bar and R charts X-bar R-bar UCL r-bar LCL r-bar UCL x-bar LCL x-bar a....
1st*variability is: in
control/out of control
2nd*no samples fall/one/two/more
3rd* in control/out of control
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five points in time during a manufacturing cycle. X Sample R 1 95.72 1.0 95.24 2 0.9 0.9 95.18 95.42 0.4 4 5 95.46 0.5 95.32 1.1 6 7 95.40 0.9 95.44 0.3 9 95.08 0.2 10 95.50 0.6 11 95.80 0.6 12...
Control A speaker manufacturer molds kevlar woofer surro surrounds are randomly sampled each five minutes, measured, and the average and range for each unds for use in 6.5 woofers. Samples of 7 woofer sample is computed. The following data represent the summary statistics for the most recent 14 Sample Mean 6.49* 6.47 6.49 6.51 6.50 6.46 6.47 6.52 6.51 6.48 6.49 6.50 6.52 6.46 Range 0.05. 0.03 0.07 0.02 0.06 0.08 0.03 0.04 0.07 0.03 0.05 0.03* 0.04 2 6...
The
Money Pit Mortgage Company is interested in monitoring the
performance of the mortgage process. Fifteen samples of five
completed mortgage transactions each were taken during a period
when the process was believed to be in control. The times to
complete the transactions were measured. The means and ranges of
the mortgage process transaction times, measured in days, are as
follows:
b.
Sample123456789 10 11 12 13 14 15 Mean 5 103 7 8 13 14 9 9 9 5...
Problem 10-25 Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. Use Exhibit 10.13. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows: Use three-sigma control limits READINGS (IN OHMS) 1014 1019...
Question pertains to the
x-chart part
Sample Mean Range 16 8 12 13 6 6 4 15 10 10 11 10 16 13 14 0 14 17 11 12 IU 12 12 11 13 14 12 7 8 13 9 11 14 7 13 15 10 15 Subsequently, samples of size 5 were taken from the process every week for the next 10 weeks. The times were measured and the following results oblained: Sample Mean Range 16 9 17 12...
A lumber company makes plywood for residential and commercial construction. Every hour, five pieces of plywood are selected and the thicknesses are measured. The accompanying graphs are the control charts for the first 20 subgroup Suppose this process remained in control for the next 40 hours. The accompanying data are the thickness measurements for hours 41 through 43. Based on these data and the two control charts, what should be concluded about the pro Has the process gone out of...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago