The sodium content of twenty 300-gram boxes of organic cornflakes was determined. The data (in milligrams) are as follows: 131.15, 130.69, 130.91, 129.54, 129.64, 128.77, 130.72, 128.33, 128.24, 129.65, 130.14, 129.29, 128.71, 129.00, 129.39, 130.42, 129.53, 130.12, 129.78, 130.92. Can you support a claim that mean sodium content of this brand of cornflakes differs from 130 milligrams? Use a = 0.05. Indicate the appropriate hypotheses test. a. Test on Mean, Variance Unknown b. Test on Variance and Standard Deviation c. Test on Population Proportion d. Test on Mean, Variance Known

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