Please explain this problem in Excel. Immigration reforms has focused on dividing illegal immigrants into two groups: Long-term and short-term. In a random sample of 1000 construction workers from the Northeast (NE), 70 are illegal short-term immigrants. In the Northwest (NW), 45 out of 1000 are illegal short-term immigrants. Calculate a 90% confidence interval for the difference in proportion of short term immigrants from NE and NW. Note: NE=Sample 1 and NW=Sample 2. Round your answer to 3 decimal places.