What are the critical t-values for a two-tailed test when 
0.02 and d.f.= 18?
Definitions:
Frequency Distribution
A frequency distribution illustrates the frequency with which each unique value appears within a dataset.
Took Physics
An indication that someone has participated in or completed a course in physics.
Nominal
A type of data that represents categories without any intrinsic order or ranking among them.
Level Of Measurement
Refers to the different ways in which variables or data points can be quantitatively and qualitatively categorized.
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