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The average number of cavities that thirty-year-old Americans have had in their lifetimes is 7. Do twenty- year-olds have a different number of cavities? The data show the results of a survey of 15 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal. 6, 8, 4, 7, 8, 5, 8, 8, 6, 6, 6, 7, 4, 6, 8 What can be concluded at the a = 0.01 level of significance? a. For this study, we should use Select an answer V b. The null and alternative hypotheses would be: Ho: ? Select an answer v H1 : ? Select an answer v c. The test statistic ? v = (please show your answer to 3 decimal places. ) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? v a f. Based on this, we should Select an answer v the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest the population mean is not significantly different from 7 at a = 0.01, so there is sufficient evidence to conclude that the population mean number of cavities for twenty-year-olds is equal to 7. The data suggest the populaton mean is significantly different from 7 at a = 0.01, so there is sufficient evidence to conclude that the population mean number of cavities for twenty-year- olds is different from 7. The data suggest that the population mean number of cavities for twenty-year-olds is not i am if im - all .. diff