Solution (source code)

= Solution

\b[TODO: the missing output is needed to name the test actually used.] A <correlation>, <multiple linear regression> adjusting for age, or another model would answer different questions. The presence of power, friendliness and age variables does not identify which were included, which was the <response variable>, how age was encoded, or whether an <interaction> was tested. Read the model call and coefficient or test table before identifying the procedure.