Question: (i) Briefly explain the least square method. (3 marks) (ii) Describe the standard deviation of errors and explain how do we calculate the standard deviation?

(i) Briefly explain the least square method. (3 marks)

(ii) Describe the standard deviation of errors and explain how do we calculate the standard deviation? (3 marks)

(iii) The company AA wants to survey 50 individuals who have purchased their product. The company has obtained a list of 800 individuals who had purchased their product last year. Describe how does the sample of 50 individuals is obtained by using a stratified sampling method. (3 marks)

(iv) Provide TWO (2) reasons why should a nonparametric technique be used instead of its parametric counterpart and TWO (2) advantages of nonparametric testing. (4 marks)

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