The average number of cavities that thirty-year-old Americans have had in their lifetimes is 7. Do twenty-year-olds have more cavities? The data show the results of a survey of 11 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal.

7, 8, 7, 6, 10, 6, 9, 8, 8, 10, 6

What can be concluded at the = 0.10 level of significance?

1. For this study, we should use Select an answer t-test for a population mean z-test for a population proportion
2. The null and alternative hypotheses would be:

H0:H0: ? p Select an answer = < >

H1:H1: ? p Select an answer > = <

1. The test statistic ? z t = (please show your answer to 3 decimal places.)
2. The p-value = (Please show your answer to 4 decimal places.)
3. The p-value is ? >
4. Based on this, we should Select an answer accept reject fail to reject the null hypothesis.