A palynologist uses a regression model to estimate ancient rainfall \( R \) from pollen ratios: \( R = 2.5P - 15 \), where \( P \) is a standardized pollen index. If the correlation between \( P \) and \( R \) improves, reducing the error margin by 20%, and originally the standard error was 3.75 mm, what is the new standard error? Also, if the original 95% confidence interval was ±7.5 mm, what is the new width? - Crosslake