PCB contamination of a river by a manufacturer is being measured by amounts of the pollutant found in fish.  A company scientist claims that the fish contain only 5 parts per million, but an investigator believes the true figure is higher.  What is the conclusion if six fish are caught and show the following amounts of PCB ( in parts per million ) 6.8, 5.6, 5.2, 4.7, 6.3, and 5.4?  Test at 5% significance level.  In addition to your conclusions, you must provide the null and alternative hypothesis , alpha and the p-value.

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