Is a reaction-time procedure susceptible to a practice effect? In other words, are response times affected by the number of previous trials a subject has had? To answer this question, a researcher gathers data from 25 subjects responding to 20 (syntactically and lexically identical) sentences and records the average response time for each trial. The researcher then determines whether response times correlate positively with order of presentation.

Create an SPSS data file for this study and save the data file to the a: drive.

Data file: dfstudy1.sav
Variables: AVTIME, ORDER

AVTIME   ORDER
2345          1
2346          2
1235          3
2367          4
2432          5
3498          6
1290          7
7630          8
2347          9
2390         10
3411         11
4511         12
4677         13
1245         14
1890         15
2333         16
1889         17
4111         18
2001         19
3999         20

Answer the following question:

1. What kind of data are in each of the two variables (nominal, ordinal, or interval)?