Suppose we wish to calculate the proportion of days that the temperature rises above 20C. Evaluate the

Question:

Suppose we wish to calculate the proportion of days that the temperature rises above 20°C. Evaluate the following sampling schemes.
1. Sample 100 consecutive days beginning on January 1.
2. Sample 100 consecutive days beginning on June 1.
3. Sample the temperature on March 15 for 100 years.
4. What might be a good method if only 100 days could be sampled?