You are going to use the methods discussed in this chapter to estimate the proportion of all cars in your area that are red. Stand on a busy street and count cars as they pass by. Count 100 cars and keep track of how many are red.
a. Using your data, compute a 95% confidence interval for the proportion of cars in your area that are red.
b. Based on how you conducted the survey, are any biases likely to influence your results? Explain.