A production line operates with a mean filling weight of 16 ounces per container. Overfilling or underfilling presents a serious problem and when detected requires the operator to shut down the production line to readjust the filling mechanism. From past data, a population standard deviation σ =0.8 ounces is assumed. A quality control inspector selects a sample of 29 items every hour and at the time makes the decision of whether to shut down the line for readjustment. The level of significance is α=0.05 If a sample mean of  = 15.42 ounces were found, what is your calculated test statistic? (keep two decimal places of your answer)

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