Symbols 
Definitions 

a. Null hypothesis 

b. Summation 

c. Factorial 

d. Nonparametric hypothesis test 

e. Population standard deviation 

f. Alternate hypothesis 

g. Maximum allowable error 

h. Population mean 

i. Probability of success in a binomial trial 
Definitions 
Terms 

a. Reliability 

b. Mode 

c. Generalization 

d. Variance 

e. Median 

f. External validity 

g. Mean 

h. Internal validity 

i. Range j. Standard deviation k. Validity 