Green & Fast Motor (GFM) manufactures passenger cars. It equips its cars with Power tyres supplied by the Power Drive Corporation (PDC), before delivering them to its two regional distributors located in the East and West of the country. PDC's product information shows that the lifespan of a Power tyre follows a Normal Distribution with mean value of 40000 kilometres km) and standard deviation of 2000 km.

Region distributor with Eco tyres while those for the West Region distributor continued to use Power tyres. A sample of cars sold by each distribution is monitored and the cars'

fuel efficiencies are recorded as shown in the data file (Fuel_Efficiencies_Eco_n_Power.xlsx).

FE with Power tyres	FE with Eco tyres
10.30	11.30
11.10	10.90
11.50	11.40
7.70	11.90
12.90	11.30
10.70	11.90
9.90	8.00
11.70	12.10
9.70	11.10
10.00	11.20
10.00	9.00
9.10	12.00
10.60	8.80
8.90	13.20
9.80	9.40
12.00	11.00
11.10	9.70
11.00	10.90
12.70	12.40
9.30	12.70
10.10	11.60
10.10	11.70
9.20	9.30
10.70	8.50
10.10
10.10

c) GFM consults you on the Statistic and Test procedures conducted. Discuss two (2) shortcomings (excludes the issue on type of Test Error in Question 2(a) and how you would have done differently to obtain more robust test results).

(c) GFM consults you on the Statistic and Test procedures conducted. Discuss two (2) shortcomings (excludes the issue on type of Test Error in Question 2(a) and how you would have done differently to obtain more robust test results).