Final answer:
The survey's 99% confidence interval does not support the claim that less than 10% of the population approve of human cloning, as the interval includes values greater than 10%.
Step-by-step explanation:
The question concerns a well-designed survey that produced a 99% confidence interval of (4%, 14%) for American adults' approval of attempts to clone a human. The claim being investigated is that less than 10% of the population approve such attempts.
When evaluating the claim against the confidence interval, it's important to understand what a confidence interval represents. It provides a range between which we can be certain, to the degree of confidence chosen (in this case, 99%), the true proportion lies. Since the provided interval is from 4% to 14%, it does include 10% but also includes values greater than 10% up to 14%. Therefore, the correct statement in relation to the claim is: Option B: The results of the survey do not support the claim since we are 99% confident the true proportion of the population who approve is between 4% and 14%. This includes results less than 10%.
An increase in the confidence percentile means a wider interval and, conversely, a decrease in the confidence percentile would result in a narrower interval if we were to alter it from 99% to 90%, for example.