A Manager Wishes to Build a 3-Sigma Range Chart for a Process

question 193

Multiple Choice

A manager wishes to build a 3-sigma range chart for a process. The sample size is five, the mean of sample means is 28.5, and the average range is 3.9. From Table S6.1, the appropriate value of D₃ is 0, and D₄ is 2.115. What are the UCL and LCL, respectively, for this range chart?

• A) 30.75 and 26.25
• B) 40.2 and 16.8
• C) 11.2 and 0
• D) 8.25 and 0
• E) 32.4 and 24.6

---

Definitions:

Leaf Scar

Marks on a stem left when the petiole of a leaf breaks during abscission.

Guttation

The exudation of drops of water from the pores of plants, occurring when soil moisture levels are high, and root pressure forces water up through the plant vascular system.

Root Pressure

A pressure within the roots of plants that pushes water upward through the plant, contributing to the movement of water and nutrients.

Vascular Cambium

A type of meristematic tissue in plants that produces vascular tissues, such as xylem and phloem, contributing to the secondary growth of stems and roots.