27. The prices of the snackfood items sold by a large supermarket chain have mean ,u = $3.34 and standard deviation 0 = $0.12. We want to take an SRS such that the sample mean has a standard deviation of 0.03. How many samples do we need? 15. For the same data in the previous question, suppose m is measured in US dollars. If the unit of m is changed from US dollars to euros (1 euro = 1.3 US dollars), the slope of the new regression line is? 16. A study shows that the quality of hospitals (better equipment, better doctors) is positively correlated with the number of patients who died in them. Why is this happening? 0 What could be a lurking variable