$3\mathrm{.}33$

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Problem $3-9($Algo$)$

a$.$ Obtain the linear trend equation for the following data on new checking accounts at Fair Savings Bank and use it to predict expected new checking accounts for periods $16$ through $19.($Round your intermediate calculations and final answers to $2$ decimal places.$)$

Period New Accounts Period New Accounts Period New Accounts

$1200623711281$

$2216724312275$

$3211825013290$

$4221925114288$

$52351026715309$

b$.$Use trend$-$adjusted smoothing with $\backslash$alpha $=\mathrm{.}2$ and $\backslash$beta $=\mathrm{.}1$ to smooth the new account data in part a$.$ What is the forecast for period $16?$ Compute the initial trend estimate $($Tt$)$ for Period $5$ as follows: $($Period $4$ data $$ Period $1$ data$)/3.$ Then compute the initial trend$-$adjusted forecast $($TAFt$)$ for Period $5$ as follows: Period $4$ data $+$ Initial trend estimate for Period $5.$ Then compute all remaining values $($including the St value for Period $5)$ using the textbook formulas or Excel template. $($Round the "Trend"values $($Tt$)$ to $3$ decimal places and all other intermediate forecast values $($TAFt and St$)$ to $2$ decimal places. Round your final answer to $2$ decimal places.$)$