| Symbol |
Description |
Symbol |
Description |
| A |
(1) An event or an event set
(2) Y intercept of the true regression line |
A1,A2,.. |
Main effects for Factor A; used
in analysis of variance |
 |
An event represented by the intersection
of events A and B. (A and B) |
 |
An event represented by the union
of events A and B. (A or B) |
| a |
Y intercept, a constant, for estimated
regression equation (y=a+bx)
used in:
(1) simple linear regression
line
(2) multiple regression
Also m in (y=b+mx) |
 (alpha) |
(1) Tail area under curves for
various probability distributions
(2) Probability of Type I
error: rejecting H0
when it is true (producer's risk)
(3) Smoothing parameters for single parameters exponential
smoothing |
| (AB)i
j |
Interaction effect; used in analysis
of variance |
B |
(1) An event or an event set
(2) Slope of the true
regression line |
| B1,B2,.. |
(1) partial regression coefficient
for the true multiple regression equation
(2) Main effects for factor B; used in analysis of variance |
b |
Slope of the estimated regression
line
(also m) |
| b1,b2,.. |
Partial regression coefficients
for the estimated multiple regression equation; point estimate of B1,B2,.. |
(beta) |
Probability of the Type
II error: accepting the null hypothesis,
H0
when it is false (consumer's risk) |
| C |
(1) Number of classes in frequency
distribution
(2) Confidence Level
(3) Acceptance number
(4) Contrast with analysis of variance |
 |
Number of possible combinations
of r items from a collection of size n, when order of selection is not
counted |
| c |
Number of columns in analysis-of-variance
layout |
c1,c2,.. |
Coefficients of 
in contrast |
| CFj |
Cumulative frequency of class interval |
 |
Chi-square
statistics |
 |
Critical value for the chi-square
statistic (random variable); represents the value exceeded 1- 
proportion of times by 
(see chi-square table) |
d |
Statistics used in two-sample inferences
representing the difference between:
(1) two sample means
(2) two sample proportions |
| di |
Matched-pairs difference between
two sample observations; used for comparing means of two populations |
 |
Mean of matched-pairs differences
di |