Difference$-$in$-$Differences $($DiD$)$ to evaluate

the effectiveness of a Buy On$-$line, Pick up in Store $($BOPS$)$ initiative. Which of the following

were true for our analysis $($indicate true $($T$),$ false $($F$),$ or cannot tell $($CT$)$ for each option

in the answer spreadsheet$)$:

a$)$ The analysis used the same treatment and control groups to evaluate the effect of the

BOPS initiative on brick$-$and$-$mortar sales and on on$-$line sales.

b$)$ The experiment described in the case was an A$/$B test

c$)$ Our analysis of the effect of the BOPS initiative on on$-$line sales assumed Canada and

the USA were trending in similar directions

d$)$ Due to an IT error, Home and Kitchen realizes the location of one of the US stores was

incorrect in the dataset; it was listed as being in the wrong part of the US$.$ This error

might invalidate the results of our analysis of the BOPS initiative on brick$-$and$-$mortar

sales.

$10$