QUESTION 1 Government authorities are actively working to close a former landfill site because controlling the biogas would make the area surrounding the site available for urban development. Historical biogas concentration records reveal that levels far exceed the limit humans can detect. The contractor wants to reassure you that recent measures to close the site significantly decreased biogas concentrations. Based on the data presented below, do the recent measurements support the contractor's observation? (6 pts) Biogas concentrations at different periods (parts per billion) Stations Historical Recent levels levels Station 1 2.43 0.15 Station 2 1.97 0.95 Station 3 3.31 0.67 Station 4 1.58 1.18 Station 5 1.90 0.49 Means 2.24 0.69 Variances 0.45 0. 16 Please answer the questions below. You can type your answers next to the questions.QUESTION 2 The mayor of Nantwich wants to assess the level of satisfaction of residents about two parks based on the time spent in these areas. Her observations are presented in the table below. Conduct an appropriate statistical test to see whether a difference in level of satisfaction exists between the two parks. (6 pts) mm III [1121!!! m Please answer the questions below. You can type your answers next to the questions. QUESTION 3 You present the results of a study on biogas emitted by a former landll site to urban planners. They are reluctant to develop this area because the odour emanating from the site could eventually lead to complaints from residents. According to recent records (see below). do biogas levels exceed the human detection threshold of 0.47 parts per billion (ppb)? (5 NS) Recent biogas concentrations (parts per billion) Stations Recent levels Station 2 mm.- Station 3 Station 4 Station 5 Mean Standard deviation Please answer the questions below. You can type your answers next to the questions. QUESTION 4 Downtown Portbury has been strongly affected by the current pandemic. Your group suggests adding benches and statues to decorate this area without affecting the pedestrian flow. You find pedestrian flow data sampled at ten different locations. The average is 19 people per minute with a standard deviation of 8. Give an interval of the mean number of pedestrians with a confidence level of 95%. (2 pts) Please answer the questions below. You can type your answers next to the questions.QUESTION 5 You are part of a team of professionals in charge of reducing the amount of heat islands. A recent study shows that a tree canopy cover of 40% represents an optimum between reduction in air temperature and revenues from municipal taxes. Which statistical hypotheses are the most appropriate to test the level of tree canopy cover? (2 pts) Choose one hypothesis among those presented below. A Ho: The mean tree canopy cover equals 40%. H1: The mean tree canopy cover is greater than 40%. B Ho: The mean tree canopy cover is different from 40%. H1: The mean tree canopy cover equals 40%. C Ho: The mean tree canopy cover equals 40%. H1: The mean tree canopy cover might be equal to 40%. D Ho: The mean tree canopy cover equals 40%. H1: The mean tree canopy cover is different from 40%. O a. Statistical hypothesesA O b. Statistical hypotheses B O 0. Statistical hypotheses C 0 d. Statistical hypotheses D You are in charge of a study comparing the commute time of car and bus users. The significance level (a) is 5%. Even if you reject the null hypothesis (Ho), this hypothesis could still be true. (2 pts) Select one: O True O False