The tapedata.x1sx file contains data for weeks during 2009-2011 for the unit sales of 3M tape, price charged, whether an ad campaign was run that week (1 = ad campaign), and whether the product was displayed on the end of the aisle (1 = end cap). Use this file to perform the following exercises:

a. Does there appear to be an upward trend in sales?

b. Analyze the nature of the monthly seasonality of tape sales.

c. Does an ad campaign appear to increase sales?

d. Does placing the tape in an end-cap display appear to increase sales? Solve using Excel if possible

\begin{tabular}{|c|c|c|c|c|} \hline Week & Ad & Endcap & Price & Units Sold \\ \hline 2/2/09 & 1 & 0 & 8.4 & 2288.909 \\ \hline 2/9/09 & 0 & 0 & 8 & 1772.035 \\ \hline 2/16/09 & 1 & 0 & 8 & 2415.035 \\ \hline 2/23/09 & 1 & 0 & 9.4 & 2842.648 \\ \hline 3/2/09 & 0 & 0 & 9.6 & 2234.832 \\ \hline 3/9/09 & 0 & 0 & 9.6 & 1655.166 \\ \hline 3/16/09 & 1 & 0 & 9.6 & 2372.606 \\ \hline 3/23/09 & 1 & 1 & 9 & 3004.852 \\ \hline 3/30/09 & 1 & 0 & 9.8 & 3107.19 \\ \hline 4/6/09 & 0 & 0 & 9.8 & 2407.234 \\ \hline 4/13/09 & 0 & 0 & 9.8 & 1924.738 \\ \hline 4/20/09 & 0 & 0 & 8.6 & 1583.737 \\ \hline 4/27/09 & 1 & 1 & 8 & 2480.772 \\ \hline 5/4/09 & 1 & 0 & 10 & 2823.579 \\ \hline 5/11/09 & 0 & 0 & 9.2 & 2136.599 \\ \hline 5/18/09 & 0 & 0 & 9 & 1665.695 \\ \hline 5/25/09 & 0 & 0 & 9.4 & 1457.549 \\ \hline 6/1/09 & 0 & 0 & 8.8 & 1302.028 \\ \hline 6/8/09 & 0 & 0 & 9.8 & 1187.939 \\ \hline 6/15/09 & 0 & 0 & 9.4 & 1100.207 \\ \hline 6/22/09 & 0 & 1 & 9 & 1196.827 \\ \hline 6/29/09 & 1 & 0 & 8.4 & 2500 \\ \hline 7/6/09 & 1 & 0 & 9.8 & 2606.878 \\ \hline 7/13/09 & 0 & 0 & 9.2 & 2175.284 \\ \hline 7/20/09 & 0 & 0 & 9.4 & 1706.496 \\ \hline 7/27/09 & 1 & 0 & 8.6 & 2561.046 \\ \hline 8/3/09 & 1 & 0 & 8.8 & 3190.59 \\ \hline 8/10/09 & 0 & 0 & 8.2 & 2582.443 \\ \hline 8/17/09 & 1 & 0 & 9.4 & 2966.381 \\ \hline 8/24/09 & 0 & 0 & 9.6 & 2328.853 \\ \hline 8/31/09 & 0 & 0 & 10 & 1906.424 \\ \hline 9/7/09 & 0 & 0 & 9.8 & 1257.456 \\ \hline 9/14/09 & 1 & 0 & 8 & 2072.59 \\ \hline 9/21/09 & 1 & 0 & 9.2 & 2542.167 \\ \hline 9/28/09 & 1 & 0 & 9.6 & 2901.974 \\ \hline 10/5/09 & 0 & 0 & 8.6 & 2293.492 \\ \hline 10/12/09 & 0 & 0 & 8 & 1825.21 \\ \hline 10/19/09 & 0 & 0 & 8.6 & 1535.283 \\ \hline 10/26/09 & 0 & 0 & 10 & 1136.977 \\ \hline 11/2/09 & 0 & 0 & 9.4 & 1041.294 \\ \hline 11/9/09 & 0 & 1 & 9.8 & 940.5422 \\ \hline 11/16/09 & 0 & 0 & 8.4 & 844.0882 \\ \hline 11/23/09 & 0 & 0 & 9.8 & 250 \\ \hline 11/30/09 & 0 & 0 & 8.8 & 220 \\ \hline 12/7/09 & 0 & 0 & 9.4 & 682.489 \\ \hline 12/14/09 & 0 & 0 & 8.2 & 760.9979 \\ \hline 12/21/09 & 0 & 1 & 9.8 & 793.8333 \\ \hline 12/28/09 & 0 & 0 & 8.4 & 292 \\ \hline 1/4/10 & 0 & 0 & 8.8 & 532.6158 \\ \hline 1/11/10 & 1 & 0 & 8.4 & 1569.107 \\ \hline 1/18/10 & 1 & 0 & 9.2 & 2246.839 \\ \hline 1/25/10 & 0 & 0 & 8.4 & 1731.357 \\ \hline 2/1/10 & 0 & 0 & 9.2 & 1341.157 \\ \hline 2/8/10 & 0 & 0 & 8.2 & 1215.964 \\ \hline 2/15/10 & 0 & 0 & 9.8 & 961.6186 \\ \hline 2/22/10 & 0 & 0 & 10 & 824.6722 \\ \hline 3/1/10 & 0 & 0 & 8.8 & 807.6725 \\ \hline 3/8/10 & 0 & 0 & 9.8 & 720.5255 \\ \hline 3/15/10 & 0 & 0 & 8.4 & 767.5491 \\ \hline 3/22/10 & 0 & 0 & 8.4 & 790.4859 \\ \hline 3/29/10 & 0 & 0 & 10 & 675.8666 \\ \hline 4/5/10 & 0 & 0 & 8.8 & 714.9287 \\ \hline 4/12/10 & 0 & 0 & 8.2 & 774.1067 \\ \hline 4/19/10 & 0 & 0 & 8.6 & 717.4998 \\ \hline 4/26/10 & 1 & 0 & 8.8 & 1657.628 \\ \hline 5/3/10 & 1 & 0 & 8.8 & 2445.441 \\ \hline 5/10/10 & 1 & 0 & 8.2 & 2968.432 \\ \hline 5/17/10 & 0 & 0 & 9.4 & 2223.085 \\ \hline 5/24/10 & 0 & 0 & 10 & 1690.82 \\ \hline \end{tabular} \begin{tabular}{|c|c|c|c|c|} \hline Week & Ad & |Endcap & |Price & Units Sold \\ \hline 5/31/10 & 0 & 0 & 10 & 1368.056 \\ \hline 6/7/10 & 0 & 0 & 9.8 & 1324.487 \\ \hline 6/14/10 & 0 & 0 & 8.6 & 1352.504 \\ \hline 6/21/10 & 0 & 0 & 8 & 1224.588 \\ \hline 6/28/10 & 0 & 0 & 9.2 & 2500 \\ \hline 7/5/10 & 0 & 0 & 8.2 & 1131.159 \\ \hline 7/12/10 & 1 & 0 & 10 & 1846.816 \\ \hline 7/19/10 & 0 & 0 & 9 & 1595.881 \\ \hline 7/26/10 & 0 & 0 & 10 & 1423.492 \\ \hline 8/2/10 & 1 & 0 & 9 & 2319.672 \\ \hline 8/9/10 & 0 & 0 & 9.2 & 1967.063 \\ \hline 8/16/10 & 0 & 0 & 9.6 & 1534.945 \\ \hline 8/23/10 & 0 & 1 & 8.6 & 1680.213 \\ \hline 8/30/10 & 0 & 0 & 9 & 1362.935 \\ \hline 9/6/10 & 0 & 0 & 8.4 & 796.4113 \\ \hline 9/13/10 & 0 & 0 & 8.2 & 720.3399 \\ \hline 9/20/10 & 0 & 0 & 9.4 & 614.0329 \\ \hline 9/27/10 & 0 & 0 & 10 & 606.6257 \\ \hline 10/4/10 & 1 & 0 & 8.4 & 1737.622 \\ \hline 10/11/10 & 1 & 0 & 8.6 & 2331.026 \\ \hline \begin{tabular}{|c|} 10/18/10 \\ \end{tabular} & 1 & 0 & 9.2 & 2827.076 \\ \hline 10/25/10 & 0 & 0 & 8.6 & 2150.678 \\ \hline 11/1/10 & 0 & 0 & 10 & 1748.892 \\ \hline 11/8/10 & 0 & 1 & 8.4 & 1572.676 \\ \hline 11/15/10 & 0 & 0 & 9.6 & 1167.037 \\ \hline 11/22/10 & 0 & 0 & 9.8 & 350 \\ \hline 11/29/10 & 0 & 0 & 8.2 & 370 \\ \hline 12/6/10 & 0 & 0 & 10 & 827.0099 \\ \hline 12/13/10 & 0 & 0 & 9 & 724.0682 \\ \hline \begin{tabular}{|l|} 12/20/10 \\ \end{tabular} & 0 & 0 & 10 & 643.5489 \\ \hline 12/27/10 & 0 & 0 & 9.6 & 312 \\ \hline 1/3/11 & 0 & 0 & 10 & 490.7803 \\ \hline 1/10/11 & 0 & 0 & 9.4 & 555.2641 \\ \hline 1/17/11 & 0 & 0 & 9.6 & 552.0339 \\ \hline 1/24/11 & 0 & 1 & 9.8 & 515.1648 \\ \hline 1/31/11 & 0 & 1 & 8.4 & 626.5843 \\ \hline 2/7/11 & 0 & 0 & 9.8 & 471.2546 \\ \hline 2/14/11 & 0 & 1 & 8.6 & 702.675 \\ \hline 2/21/11 & 0 & 0 & 9.8 & 544.8112 \\ \hline 2/28/11 & 0 & 0 & 8.2 & 602.8991 \\ \hline 3/7/11 & 0 & 0 & 9.2 & 617.7874 \\ \hline 3/14/11 & 0 & 1 & 9.2 & 716.6735 \\ \hline 3/21/11 & 0 & 0 & 8.2 & 682.9724 \\ \hline 3/28/11 & 0 & 0 & 9.2 & 659.3194 \\ \hline 4/4/11 & 0 & 0 & 8 & 811.3331 \\ \hline 4/11/11 & 1 & 0 & 10 & 1589.878 \\ \hline 4/18/11 & 1 & 0 & 9.8 & 2396.038 \\ \hline 4/25/11 & 1 & 0 & 9.4 & 2816.306 \\ \hline 5/2/11 & 0 & 0 & 9.2 & 2244.674 \\ \hline 5/9/11 & 0 & 1 & 9.4 & 1762.614 \\ \hline 5/16/11 & 0 & 0 & 9.6 & 1412.773 \\ \hline 5/23/11 & 0 & 0 & 9.6 & 1239.807 \\ \hline 5/30/11 & 0 & 0 & 8.8 & 1000.097 \\ \hline 6/6/11 & 1 & 0 & 8.2 & 2140.022 \\ \hline 6/13/11 & 1 & 0 & 8.4 & 2727.653 \\ \hline 6/20/11 & 0 & 0 & 9.4 & 2157.244 \\ \hline 6/27/11 & 0 & 0 & 8.4 & 1832.439 \\ \hline 7/4/11 & 0 & 0 & 8.6 & 1509.71 \\ \hline 7/11/11 & 0 & 0 & 8.4 & 1380.028 \\ \hline 7/18/11 & 0 & 0 & 8 & 1380.066 \\ \hline 7/25/11 & 0 & 0 & 9.8 & 1067.172 \\ \hline 8/1/11 & 0 & 0 & 9.2 & 1189.008 \\ \hline 8/8/11 & 0 & 0 & 9.4 & 975.6982 \\ \hline 8/15/11 & 0 & 0 & 8.8 & 1049.158 \\ \hline 8/22/11 & 0 & 0 & 9.4 & 929.7402 \\ \hline 8/29/11 & 0 & 0 & 10 & 862.5934 \\ \hline \end{tabular}