Some city leaders have attempted to improve air quality by decreasing the rates of air pollution. Below are the monthly average air pollutions readings from 2011. Monthly average air pollution readings for San Antonio in parts per billion (ppb) for 2011. 42 44 40 48 45 47 38 40 31 38 46 45 Does the data prove that San Antonio has decreased pollution levels from the previous years average of 43 ppb in 2010? Use alpha level of .05 when answering the questions below. Descriptive Statistics from Excel can be performed on the data set and should be used to support your analysis. (1 point extra credit if you paste your descriptive statistics here) State the Null and Alternative Hypothesis. Write one sentence for each. Or use the notation. (1/2 point) Calculate the value of the test statistic. Show your work. (1 point) State your critical value. (1/2 point) Do you Reject or Fail to Reject your Null Hypothesis? Write one sentence comparing your critical value to the test statistic to defend your decision. (1 point) Can the city say they have decreased their pollution levels from the previous years reading of 45? Write 1 sentence defending your answer using the results of the hypothesis test. (1 point)

Some city leaders have attempted to improve air quality by decreasing the rates of air pollution. Below are the monthly average air pollutions readings from 2011. Monthly average air pollution readings for San Antonio in parts per billion (ppb) for 2011. 42 44 40 48 45 47 38 40 31 38 46 45 Does the data prove that San Antonio has decreased pollution levels from the previous years average of 43 ppb in 2010? Use alpha level of .05 when answering the questions below. Descriptive Statistics from Excel can be performed on the data set and should be used to support your analysis. (1 point extra credit if you paste your descriptive statistics here) State the Null and Alternative Hypothesis. Write one sentence for each. Or use the notation. (1/2 point) Calculate the value of the test statistic. Show your work. (1 point) State your critical value. (1/2 point) Do you Reject or Fail to Reject your Null Hypothesis? Write one sentence comparing your critical value to the test statistic to defend your decision. (1 point) Can the city say they have decreased their pollution levels from the previous years reading of 45? Write 1 sentence defending your answer using the results of the hypothesis test. (1 point)