b$.$ Compute the sales forecast for July using the approaches given below. Do not round intermediate calculations. Round your answers to the nearest whole number.

a three$-$month moving average

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a weighted three$-$month moving average using $0\mathrm{.}40$ for June, $0\mathrm{.}40$ for May, and $0\mathrm{.}20$ for April

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a linear trend equation

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exponential smoothing with $a($smoothing constant$)$ equal to $0\mathrm{.}40,$ assuming a February forecast of $19,000$

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MAD $($three$-$month moving average$)$:

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MAD $($weighted three$-$month moving average$)$:

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MAD $($linear trend equation$)$:

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MAD $($exponential smoothing$)$:

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Which is the best? Why?

The weighted three$-$month moving average $V$ is better because it provides the