General health survey. The Centres for Disease Control and Prevention (CDCP) in Atlanta, Georgia, conducts an annual survey of the general health of the U.S. population as part of its Behavioural Risk Factor Surveillance System. Using random-digit-dialing, the CDCP telephones U.S. citizens over 18 years of age and asks them the following four questions:

1. Is your health generally excellent, very good, good, fair, or poor?

2. How many days during the previous 30 days was your physical health not good because of injury or illness?

3. How many days during the previous 30 days was your mental health not good because of stress, depression, or emotional problems?

4. How many days during the previous 30 days did your physical or mental health prevent you from performing your usual activities?

Identify the parameter of interest for each question

In the above survey being conducted, we have to find the parameters of interest in each question.

The parameter of interest is: p = proportion with excellent health. The term "health" refers to an entire condition of physical and mental well-being. Healthcare exists to assist individuals in maintaining their best health.

The parameter of interest is: $\mathrm{\mu }$= mean number of days when health is not good. Healthy days are the polar opposite of unhealthy days. Healthy days are derived by subtracting the number of unwell days from 30 days as well as approximating the number of recent days when a patient's mental and physical well-being was excellent (or superior).

The parameter of interest is: $\mathrm{\mu }$= mean number of days when mental health is not good because of stress, depression, or emotional problems. Unhealthy days estimate the total amount of time in the preceding 30 days when the participant's mental or physical well-being was not excellent. To get this estimation, integrate the results from questions 2 and 3 to create a summary score of overall unwell days, with a reasonable maximum of 30 problematic days.

The parameter of interest is: $\mathrm{\mu }$= mean number of days when physical or mental health is not good and prevents one from performing usual activities. Aerobic or a mixture of cardiovascular as well as muscular activities for 30 to 60 minutes three to five days a week have been shown to boost mental well-being. According to numerous studies, even low amounts of physical exercise may provide a few benefits. Regular physical exercise tends to lessen problems of stress or depression in adolescents as well as children. It is unsure if physical activity boosts self-esteem.