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A Retailing Outlet Has Been Keeping Daily Sales Records Over

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A retailing outlet has been keeping daily sales records over the past four weeks, as shown below.  Week  Day 1234 Monday 20252227 Tuesday 26302628 Wednesday 28292926 Thursday 34323431 Friday 38353736\begin{array}{l}\quad\quad\quad\quad\quad\quad\quad\quad\quad\text { Week }\\\begin{array} { | l | c c c c | } \hline \text { Day } & 1 & 2 & 3 & 4 \\\hline \text { Monday } & 20 & 25 & 22 & 27 \\\text { Tuesday } & 26 & 30 & 26 & 28 \\\text { Wednesday } & 28 & 29 & 29 & 26 \\\text { Thursday } & 34 & 32 & 34 & 31 \\\text { Friday } & 38 & 35 & 37 & 36 \\\hline\end{array}\end{array} a. Use the regression technique to calculate the linear trend line.
b. Calculate the daily indexes based on the regression trend line in part (a).
c. What do the daily indexes tell us?


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