$(5)$ A linear trend equation

c$.$ Which method seems least appropriate?

Why? $($Hint: Refer to your plot from part a$.)$ d$.$ What does use of the term sales rather than demand presume?

$2/5$

$2.$ 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 $19.$

$\backslash$table$[[$Period$,\backslash$table$[[$New$],[$Accounts$]],$Period,$\backslash$table$[[$New$],[$Accounts$]],$Pet$],[1,199,6,231,11],[2,213,7,247,12],[3,210,8,251,13],[4,227,9,252,14],[5,234,10,266,15]]$

b$.$ Use trend$-$adjusted smoothing with $=\mathrm{.}3$ and $=\mathrm{.}2$ to smooth the new account data in part a$.$ What is the forecast for period $16?$