7. A dental insurance company is interested in determining the percentage of adults who visit the dentist on a yearly basis. Based on a survey of a random sample of adults, the insurance company reports a sample percentage of 32%, with a margin of error of 2. 1%. How should this margin of error be interpreted? A. With a certain level of confidence, the interval from 29.9% to 34.1% includes the percentage of adults in the population who visit the dentist on a yearly basis. B. With a certain level of confidence, the interval from 29.9% to 34.1% includes the percentage of adults in the sample who visit the dentist on a yearly basis. C. In the sample, 2.1% of the adults who were surveyed lied about their visits to the dentist. D. Only 2.1% of the population was included in the sample. E. There is a 2.1% chance a mistake was made when data was gathered from this particular sample. 8. The critical value, or z*, that is used to construct a confidence interval for a proportion depends upon A. the sample size. B. the confidence level. C. the sample size and the confidence level. D. the sample size and the sample proportion. E. the sample size, the confidence level, and the sample proportion