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You are working for Nike and are testing the amount of Nike Air Max $270$s being kept in inventory at outlets that sell the shoes. To meet demand, the outlets are supposed to have $55$ Air Max $270$s in stock at the beginning of the week. You randomly select $32$ outlets and check their inventory at the beginning of the week. You find that they had an average of $53$ Air Max $270$s in stock. Assume you know the population standard deviation of inventory at the beginning of the week to be $8\mathrm{.}9$ shoes. Use a $5\%$ significance level to test if Nike Air Max $270$s are being understocked.

What is the value of the test statistic? Round your answer to $2$ decimals.

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