4 The owner of rental houses claims that the average length of occupancy is 3.2 years. A random sample of 35 rental contracts were selected and analysed using SPSS. One-Sample Statistics N Mean Std. Deviation Std. Error Mean Length (years) 35 3.446 1.0551 T a) Show that T is 0.1783. (2 marks) b) Construct a 95% confidence interval for the average length of occupancy of properties owned by the owner. (3 marks) c) Based on the confidence interval in b), is the owner's claim true? Give a reason to support your answer. (2 marks)