= Solution
The two <independent variables> are social-cue congruence, with congruent and incongruent levels, and cue-to-response delay, with short ($250$ ms) and long ($750$ ms) levels. The <response variable> is reproduction <reaction time>, measured in seconds. Thus the known treatment structure is \b[a $2\times2$ <factorial design>], potentially estimating two <main effects> and their <interaction>.
\b[TODO: identify the allocation from the missing supplementary sheet or protocol.] The eighty recruited participants do not establish whether either factor is <within-subjects> or <between-subjects>, whether all observations were retained, or how trials were summarized. The design cannot responsibly be called fully repeated-measures, fully independent-groups or mixed without that information.
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