The Excel file$$Closing Stock Prices$$provides data for four stocks and the Dow Jones Industrial Average over a one$-$month period.

Develop a spreadsheet for forecasting each of the stock prices and the DJIA using a simple two$-$period and three$-$period moving average.

Compute MAD, MSE, and MAPE and determine whether two or three moving average periods is better.

The Excel file$$Closing Stock Prices$$provides data for four stocks and the Dow Jones Industrial Average over a one$-$month period.

Develop a spreadsheet model for forecasting each of the stock prices using simple exponential smoothing with a smoothing constant of$$

Compare your results to the output from Excel$$s$$Data Analysis$$tool$.$

Compute MAD, MSE, and MAPE.

Does a smoothing constant of$$or$$ yield better results?

$13.$ Consider the prices for the Dow Jones Industrials in the Excel file Closing Stock Prices. Use simple linear regression to forecast the data. What would be the forecasts for the next three days? $\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|$c$|$c$|\}$

$\backslash$hline Closing Stod & k Prices & & & & $\backslash \backslash$

$\backslash$hline Date & IBM & INTC & CSCO & GE & DJ Industrials Index $\backslash \backslash$

$\backslash$hline $9/3/10$ & $\backslash$$$127\mathrm{.}58$ & $\backslash$$$18\mathrm{.}43$ & $\backslash$$$21\mathrm{.}04$ & $\backslash$$$15\mathrm{.}39$ & $10447\mathrm{.}93\backslash \backslash$

$\backslash$hline $9/7/10$ & $\backslash$$$125\mathrm{.}95$ & $\backslash$$$18\mathrm{.}12$ & $\backslash$$$20\mathrm{.}58$ & $\backslash$$$15\mathrm{.}44$ & $10340\mathrm{.}69\backslash \backslash$

$\backslash$hline $9/8/10$ & $\backslash$$$126\mathrm{.}08$ & $\backslash (\backslash$$ $17\mathrm{.}90\backslash )$ & $\backslash$$$20\mathrm{.}64$ & $\backslash (\backslash$$ $15\mathrm{.}70\backslash )$ & $10387\mathrm{.}01\backslash \backslash$

$\backslash$hline $9/9/10$ & $\backslash$$$126\mathrm{.}36$ & $\backslash (\backslash$$ $18\mathrm{.}00\backslash )$ & $\backslash$$$20\mathrm{.}61$ & $\backslash$$$15\mathrm{.}91$ & $10415\mathrm{.}24\backslash \backslash$

$\backslash$hline $9/10/10$ & $\backslash$$$127\mathrm{.}99$ & $\backslash$$$17\mathrm{.}97$ & $\backslash$$$20\mathrm{.}62$ & $\backslash$$$15\mathrm{.}98$ & $10462\mathrm{.}77\backslash \backslash$

$\backslash$hline $9/13/10$ & $\backslash$$$129\mathrm{.}61$ & $\backslash$$$18\mathrm{.}56$ & $\backslash$$$21\mathrm{.}26$ & $\backslash$$$16\mathrm{.}25$ & $10544\mathrm{.}13\backslash \backslash$

$\backslash$hline $9/14/10$ & $\backslash$$$128\mathrm{.}85$ & $\backslash$$$18\mathrm{.}74$ & $\backslash$$$21\mathrm{.}45$ & $\backslash$$$16\mathrm{.}16$ & $10526\mathrm{.}49\backslash \backslash$

$\backslash$hline $9/15/10$ & $\backslash$$$129\mathrm{.}43$ & $\backslash$$$18\mathrm{.}72$ & $\backslash$$$21\mathrm{.}59$ & $\backslash$$$16\mathrm{.}34$ & $10572\mathrm{.}73\backslash \backslash$

$\backslash$hline $9/16/10$ & $\backslash$$$129\mathrm{.}67$ & $\backslash$$$18\mathrm{.}97$ & $\backslash$$$21\mathrm{.}93$ & $\backslash$$$16\mathrm{.}23$ & $10594\mathrm{.}83\backslash \backslash$

$\backslash$hline $9/17/10$ & $\backslash$$$130\mathrm{.}19$ & $\backslash$$$18\mathrm{.}81$ & $\backslash$$$21\mathrm{.}86$ & $\backslash$$$16\mathrm{.}29$ & $10607\mathrm{.}85\backslash \backslash$

$\backslash$hline $9/20/10$ & $\backslash$$$131\mathrm{.}79$ & $\backslash (\backslash$$ $18\mathrm{.}93\backslash )$ & $\backslash$$$21\mathrm{.}75$ & $\backslash$$$16\mathrm{.}55$ & $10753\mathrm{.}62\backslash \backslash$

$\backslash$hline $9/21/10$ & $\backslash$$$131\mathrm{.}98$ & $\backslash$$$19\mathrm{.}14$ & $\backslash$$$21\mathrm{.}64$ & $\backslash$$$16\mathrm{.}52$ & $10761\mathrm{.}03\backslash \backslash$

$\backslash$hline $9/22/10$ & $\backslash$$$132\mathrm{.}57$ & $\backslash$$$19\mathrm{.}01$ & $\backslash$$$21\mathrm{.}67$ & $\backslash$$$16\mathrm{.}50$ & $10739\mathrm{.}31\backslash \backslash$

$\backslash$hline $9/23/10$ & $\backslash$$$131\mathrm{.}67$ & $\backslash$$$18\mathrm{.}98$ & $\backslash$$$21\mathrm{.}53$ & $\backslash$$$16\mathrm{.}14$ & $10662\mathrm{.}42\backslash \backslash$

$\backslash$hline $9/24/10$ & $\backslash (\backslash$$ $134\mathrm{.}11\backslash )$ & $\backslash$$$19\mathrm{.}42$ & $\backslash$$$22\mathrm{.}09$ & $\backslash$$$16\mathrm{.}66$ & $10860\mathrm{.}26\backslash \backslash$

$\backslash$hline $9/27/10$ & $\backslash$$$134\mathrm{.}65$ & $\backslash$$$19\mathrm{.}24$ & $\backslash$$$22\mathrm{.}11$ & $\backslash (\backslash$$ $16\mathrm{.}43\backslash )$ & $10812\mathrm{.}04\backslash \backslash$

$\backslash$hline $9/28/10$ & $\backslash$$$134\mathrm{.}89$ & $\backslash$$$19\mathrm{.}51$ & $\backslash$$$21\mathrm{.}86$ & $\backslash$$$16\mathrm{.}44$ & $10858\mathrm{.}14\backslash \backslash$

$\backslash$hline $9/29/10$ & $\backslash$$$135\mathrm{.}48$ & $\backslash$$$19\mathrm{.}24$ & $\backslash$$$21\mathrm{.}87$ & $\backslash$$$16\mathrm{.}36$ & $10835\mathrm{.}28\backslash \backslash$

$\backslash$hline $9/30/10$ & $\backslash$$$134\mathrm{.}14$ & $\backslash$$$19\mathrm{.}20$ & $\backslash$$$21\mathrm{.}90$ & $\backslash$$$16\mathrm{.}25$ & $10788\mathrm{.}05\backslash \backslash$

$\backslash$hline $10/1/10$ & $\backslash$$$135\mathrm{.}64$ & $\backslash$$$19\mathrm{.}32$ & $\backslash$$$21\mathrm{.}91$ & $\backslash$$$16\mathrm{.}36$ & $10829\mathrm{.}68\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$