Scroll Assignment 3 [10] Num Lock Based on the data from the last 30 days, economists estimated 95% confidence interval for average exchange rate PLN / EUR as: 4.90 - 5.10 assuming that the distribution of the exchange rate for all possible days is normal. me a. What is the sampling error (SE) for this estimation [1] b. What would be the sampling error (SE) if they would estimate the interval based on 10 days (other parameters unchanged)? [4] What would be the confidence interval if the standard deviation used in the C. calculations is two times smaller? With other values unchanged (95% confidence interval, 30 days)? [4] d. What is the point estimation of average exchange rate after the correction (from point d)? Is it different than in the first calculation (by economists)? [1]