The $z-$values for $90\%$ service level, $95\%$ service level, and $99\%$ service level are

$1\mathrm{.}282,1\mathrm{.}645,$ and $2\mathrm{.}326.$ Using the data from the Safety Stock Example Exercise:

a$.$ Prepare a table showing the safety stock holding costs for each service level.

Update your table to reflect:

b$.$ Cutting the average lead time in half.

c$.$ Cutting the lead time standard deviation in half.

d$.$ Cutting the daily demand standard deviation in half.

e$.$ All three reductions simultaneously.

Write a one page summary addressing the effect of service level on cost and the

sensitivity of cost to changes in the parameters. PUT TH EXCE USED!