A local bottler in Hawaii wishes to ensure that an average of 20 ounces of passion fruit juice is used to fill each bottle. In order to analyse the accuracy of the bottling process, he takes a random sample of 32 bottles. The mean weight of the passion fruit juice in the sample is 19.63 ounces. Assume that the population standard deviation is 0.80 ounce. Use the critical value approach to test the bottler's concern at α=0.05.

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