Chapter 14: Q3BSC (page 654)
Control Limits In constructing a control chart for the proportions of defective dimes, it is found that the lower control limit is -0.00325. How should that value be adjusted?
The value of the lower control limit should be adjusted to 0.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
Examine the following p-chart for defective calculator batteries and briefly describe the action that should be taken.a
Use the survey results given in Exercise 1 and use a 0.05 significance level to test the claim that the majority of adults learn about medical symptoms more often from the internet than from their doctor.
Service Times The Newport Diner records the times (min) it takes before customers are asked for their order. Each day, 50 customers are randomly selected, and the order is considered to be defective if it takes longer than three minutes. The numbers of defective orders are listed below for consecutive days. Construct an appropriate control chart and determine whether the process is within statistical control. If not, identify which criteria lead to rejection of statistical stability.
3 2 3 5 4 6 7 9 8 10 11 9 12 15 17
Energy Consumption. Exercises 1–5 refer to the amounts of energy consumed in the author’s home. (Most of the data are real, but some are fabricated.) Each value represents energy consumed (kWh) in a two-month period. Let each subgroup consist of the six amounts within the same year. Data are available for download at www.TriolaStats.com.
Jan.-Feb. | Mar.-April | May-June | July-Aug. | Sept.-Oct. | Nov.-dec. | |
Year 1 | 3637 | 2888 | 2359 | 3704 | 3432 | 2446 |
Year 2 | 4463 | 2482 | 2762 | 2288 | 2423 | 2483 |
Year 3 | 3375 | 2661 | 2073 | 2579 | 2858 | 2296 |
Year 4 | 2812 | 2433 | 2266 | 3128 | 3286 | 2749 |
Year 5 | 3427 | 578 | 3792 | 3348 | 2937 | 2774 |
Year 6 | 4016 | 3458 | 3395 | 4249 | 4003 | 3118 |
Year 7 | 4016 | 3458 | 3395 | 4249 | 4003 | 3118 |
Year 8 | 4016 | 3458 | 3395 | 4249 | 4003 | 3118 |
Energy Consumption:\(\bar x\)Chart Let each subgroup consist of the 6 values within a year. Construct an\(\bar x\)chart and determine whether the process mean is within statistical control. If it is not, identify which of the three out-of-control criteria lead to rejection of a statistically stable mean.
In Exercises 5–8, use the following two control charts that result from testing batches of newly manufactured aircraft altimeters, with 100 in each batch. The original sample values are errors (in feet) obtained when the altimeters are tested in a pressure chamber that simulates an altitude of 6000 ft. The Federal Aviation Administration requires an error of no more than 40 ft at that altitude.
What is the value of\(\bar R\)? In general, how is a value of\(\bar R\)obtained?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
