Question: Light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of five bulbs are

Light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of five bulbs are chosen from the output, and the luminance is measured. The sample mean and the standard deviation s are found. After 30 samples, the following summary information is obtained:

The specifications are 90 ± 15 lumens.
(a) Find the control limits for the - and s-charts.
(b) Assuming that the process is in control, estimate the process mean and process standard deviation.
(c) Comment on the ability of the process to meet specifications. What proportion of the output is nonconforming?
(d) If the process mean is moved to 90 lumens, what proportion of output will be nonconforming? What suggestions would you make to improve the performance of the process?

5-2550 42195 .- = 2550 1

Step by Step Solution

★★★★★

3.46 Rating (159 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a The control limits for an schart are UCL 208965 13578 LCL 065 0 The control limits for an X chart ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

918-M-S-Q-C-B-S (1048).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

A sample of 200 individuals are tested for their blood type, and the results are used to test the hypothesized distribution of blood types: At the 0.05 level of significance, is there sufficient...

What recommendations would you make to improve the compensation system in a way that would likely improve customer satisfaction?

What recommendations would you make to improve the effectiveness of today's boards of directors?

Light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of five bulbs are chosen from the output, and the luminance is...

7-26 Light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of five bulbs are chosen from the output, and the luminance is...

please give me solution in detail. ( 30 points) light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of five bulbs are...

Light bulbs are tested for their luminance, with the intensity of brightness desired to be within a certain range. Random samples of 5 bulbs are chosen from the output and their luminance values...

Probability and Statistics - Problem Set c Keith M. Chugg October 2, 2015 1 Preliminaries, Combinatorics, Set Probability 1.1. A number of bats are in a cave. 2 bats can see out of their left eye. 3...

Based on the selected article answer the following questions: What is the basic theme of the article? Try to state it in just one or two paragraphs. Did the article present a good support base?...

The Wetski Water Ski Company is the worlds largest producer of water skis. As you might suspect, water skis exhibit a highly seasonal demand pattern, with peaks during the summer months and valleys...

Watkins Production purchased a new computerized machine at a cost of $450,000. The machine has a residual value of $64,000 and an expected life of 5 years. The actual machine hours were a total of...

Using a supply and demand diagram, illustrate the effects of the tariffs imposed on imported steel by the United States. How will these tariffs affect American manufacturers and consumers?

In words, explain what is measured by SS, variance, and standard deviation.

What is the logic behind the control chart for the sample mean, and how is the chart constructed?

Boston-based Legal Seafoods prides itself on having instituted an advanced quality control system that includes the control of both food quality and service quality. The following are successive...

Rolls Royce makes the Trent 900 jet engines used in the new Airbus A380 planes, and needs to control the maximum thrust delivered by the engines. The following are readings related to power for...

Telephone Calls A researcher knew that before cell phones, a person made on average 3.2 calls per day. He believes that the number of calls made per day today is higher. He selects a random sample...

Let X be a random variable, which has a density function f depending on the parameter > 1 f ( x ; ) = {( 1 ) ( x 2 ) 2 , when 2 3 and 0 , otherwise. We have a random sample ( X 1 , ... , X n ) , the...

Consider a 3-year risk-free bond, which pays annual coupons. The coupon rate is 3.5% and the face value is 500. The bond is issued at time t=0, pays coupons at time t=1,2,3 and face value at time...