Medical researchers compared the measured calories in eight locally prepared health and diet foods purchased in Manhattan, New York, with the calories listed on the label [23]. The data in Table 7.4 are the percentage differences between the actual and labeled calories (a positive value means that the measured calories exceeded the amount shown on the product label). Determine the two-sided P value for a test of the null hypothesis that the population mean is 0.

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Chinese chicken Gyoza 15 60 Jelly diet candy-red 250 Jelly diet candy fruit 145 Florentine manicotti Egg foo young Hummus with salad Baba ghanoush with salad 6 80 95 3