Help unlv.instructure.com Question 21 Attending Event STAT 391 1005 - 2022 Sprg Event (150050) 1 pts Clinical literature reports that the duration of a typical cold is roughly 20 days. Researchers wanted to know if people tend to underestimate the duration of a typical cold, on average. They surveyed a random sample of 360 healthy adults in Georgia and asked them how long they think that a typical cold lasts. The researchers reported a 95% confidence interval of 6.5 to 7.9 days for the mean expected duration of typical cold. The numerical value of the margin of error for the confidence interval reported here is [ans] days 1 pts Question 22 The level of nitrogen oxides (NOX) in the exhaust of cars of a particular model varies Normally with standard deviation o = 0.05 grams per mile (g/mi). Government regulations call for NOX emissions no higher than 0.3 g/mi. In testing Ho : u = 0.3 versus Ha : M