The south African department of health is concerned that the average percentage mark-up on a particular products during the dawn of covid-19 pandemic is 41% or above. To test their concern, they sampled 40 that sell the product, and found that the mean percentage mark-up was 49.1%. Assume that the population deviation of the percentage mark-up is 18.7% and answer the following questions: What is the appropriate test statistic for this management scenario? Why?

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