Identify the most appropriate statistic to analyze each of the following studies and explain why you should use the statistical test you have named.
1. Is there a favorite snack among elementary school students? Students select from among three snacks (healthy, moderately healthy, junk food).
2. Researchers are interested in whether clients at a medical clinic are satisfied with their health care. Those using the clinic are asked to respond "yes," "somewhat," or "no" to whether they are satisfied before and again after they participate in a new program that includes additional follow-up calls and e-mails.
3. Is students' preference for type of snack (healthy, moderately healthy, junk food) related to their weight class (normal, overweight, obese)? Students select a snack and are also classified in terms of their weight.
4. Potential voters are asked to view the same 30-second television ad for a candidate 6 months, 1 month, and 1 week before an election. The voters note whether the ad does or does not effectively represent the candidate's views.