Much concern has been expressed regarding the practice of using nitrates as meat preservatives. In one study

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Much concern has been expressed regarding the practice of using nitrates as meat preservatives. In one study involving possible effects of these chemicals, bacteria cultures were grown in a medium containing nitrates. The rate uptake of radio-labeled amino acid was then determined for each culture, yielding the following observations:
Much concern has been expressed regarding the practice of using

Suppose that it is known that the true average uptake for cultures without nitrates is 8,000. Do these data suggest that the addition of nitrates results in a decrease in the mean uptake? Test the appropriate hypotheses using a significance level of 0.10.

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