1. Don’s HDRG (Handy Dandy Reference Guide)
Variables Control Chart formulas
GRAND AVERAGE & AVERAGE RANGE
RANGE CONTROL LIMITS
AVERAGE CONTROL LIMITS
INDIVIDUALS CONTROL LIMITS
CAPABILITY
Attribute Control Chart formulas
U control limits
P control limits
C control limits
np control limits
p = fraction defective
n = sample size
k = number of samples
u = defects per unit
c = defects
np = number of defectives
p/np Charts
c Charts
u Charts
Reliability

2. Z table – Areas under the Normal Curve
Student t table Z
Z table – Areas under the Normal Curve
 level
v t.95 t.975 t.995 t.9995 ¥
INTERVAL
Scale Charts Proceedure
1. Determine High & Low Values. (Control Limits Work Well)
2. High - Low = Range
3. Count Lines = N
4. N/2 = T
5. Range/t = Interval
6. From Chart Find:
Line Value
Major Line Each ? Marks
Round Center to Nearest
7. (High + Low)/2 = Center (Round Off)
8. Assign Major Center Line Mark
9. Label Each Major Line Mark
10. Complete Chart
Each MAJOR ROUND
Line line Center
3 VARIABLE DOE MATRIX A - + B C AB AC BC
YIELD___
___ ___
___
ABC - +