In the Opening Vignette, Justine Introduced New Chairs in Her

Multiple Choice

In the opening vignette, Justine introduced new chairs in her parent's company and measured productivity. Results looked promising at first but productivity gains were lost eventually. Having studied problems in research it was concluded that Justine's project suffered from a __________ bias.

A) random assignment
B) reliability
C) Hawthorne effect
D) validity
E) placebo effect