Question: By law, the levels of toxic organic compounds in fish are constantly monitored. A technique, called matrix solid-phase dispersion (MSPD), has been developed for chemically extracting trace organic compounds from fish specimens ( Chromatographia , March 1995). The MSPD method was tested as follows. Uncontaminated fish fillets were injected with a known amount of toxin. The MSPD method was then used to extract the contaminant and the percentage of the toxic compound recovered was measured. The recovery percentage for n = 5 fish fillets are listed below:

99, 102, 94, 99, 95

Does the data provide sufficient evidence to indicate that the mean recovery percentage of the toxic compound exceeds 85% using the new MSPD method? Test using 5% level of significance.  Report your test results and draw conclusion.

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