The sodium content of twenty 300 gram boxes of organic corn flakes was determined. The data ( in milligrams ) are as follows : 131.15 130.69 130.91 130.12 130.72 128.33 129.78 128.24 130.91 130.42 128.73 131.15 129.65 130.86 127.98 131.05 128.75 129.30 128.98 130.12 a. Can you support the claim that the mean sodium content of this brand of cornflakes is different from 130.5 milligrams at 5 % level of significance? (show all the steps of hypothesis testing)

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