Answer: String variables
Explanation:
SPSS means Statistical Package for Social Sciences.
The SPSS has only two variables namely:
1. String variables which includes numbers,letters and other characters.
The string variables cannot perform calculations. It is basically used to type names of people, age,occupation,home addresses,email addresses e.t.c Which is what is what the researcher was trying to do.
2. Numeric variables which include only numbers. It can perform calculations too using mathematical operations like addition,multiplication,division and subtraction.