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A shoe manufacturer claims that among the general population of adults in the United States, the average length of the left foot is longer than that of the right. To compare the average length of the left foot with that of the right, we can take a random sample of 7 U.S. adults and measure the length of the left foot and then the length of the right foot for each person in the sample, and the results were given in the following table. Adult 2 3 4 5 6 Left foot 10.5 8.5 9.5 11.2 10.7 11.5 8.0 Right foot | 10.2 8.7 9.0 11.1 10.2 11.0 8.2 Denote by up the mean of the differences of the lengths between the left foot and the right foot of all adults in U.S., where D="length for the left foot - length for the right foot ". Denote by M1 and M2 the means length for the left foot and for the right foot of all adults in U.S., respectively. Test the claim at a 0.07 level of significance. What is the null and alternative hypotheses? Ha and H1 are referred to an alternative hypothesis. O Ho : MD O O Ho : M1