Q#3. a. During the measurements the errors in measurements were recorded as 0.1. 0.1. 0.X. -0.3. -0.4. -0.X. 0.9. 0.01. -0.1. X Verify the claim that the errors have zero mean, assume that the population has a variance of 0.20 with significance level of 1%. b. The criterion for issuing a smog alert is established at greater than 8 ppm of a particular pollutant. Samples collected from 16 stations in a certain city give an average value of 8.84 ppm with a variance of 4ppm. Do these findings indicate that the smog alert criterion has been exceeded