Which survey is most likely to have the least bais?

Options

A. Surveying a sample of people leaving a movie theater to determine which flavor of ice cream is the most popular.
B. surveying the members of a football team to determine the most watched TV sport
C. surveying a sample of people leaving a lilbrary to determine the average number of books a person reads in a year
D. surveying a sample of people leaving a gym to determine the average number of hours a person exercise per week

Answer

To determine which survey is most likely to have the least bias, we need to analyze the options provided and understand the concept of bias in surveys. Bias occurs when the sample selected for a survey is not representative of the general population or when the selection process influences the results in a particular direction.

### Step-by-Step Solution:

1. **Understand Bias**:
- Bias in surveys occurs when the sample chosen is not representative of the population being studied. This can happen if the subjects selected are more likely to produce a specific outcome.

2. **Analyze Each Option**:
- **Option A**: Surveying a sample of people leaving a movie theater to determine which flavor of ice cream is most popular.
- Analysis: The preference for ice cream flavors is unlikely to be influenced by the movie watched. Therefore, this sample is not biased towards any specific flavor.

- **Option B**: Surveying members of a football team to find out which sport they prefer.
- Analysis: Members of a football team are likely to have a preference for football, leading to a biased result towards that sport.

- **Option C**: Surveying people leaving a library to determine how many books they read in a month.
- Analysis: People leaving a library are likely to be avid readers, which would skew the results towards a higher number of books read, indicating bias.

- **Option D**: Surveying people leaving a gym to find out how many hours they work out in a week.
- Analysis: Similar to the library example, people leaving a gym are likely to work out more than the average person, leading to biased results.

3. **Determine the Least Biased Option**:
- After analyzing all options, **Option A** stands out as the least biased because the sample of people leaving a movie theater is not likely to influence their ice cream preferences. The other options involve groups that are likely to have a specific bias related to their activities.

4. **Conclusion**:
- Therefore, the survey that is most likely to have the least bias is **Option A**.