a) Complete the following sentence: Estimation means assiqning values to a based on the value of a (2 marks) b) What happen to the width of confidence interval when we increase the sample size? (1 mark) QUESTION 2 (12 MARKS) A researcher would like to study the effectiveness of a special course designed to improve memory. He would like to measure the scores of memory test. Suggest your idea to assist the researcher to conduct the study by answering the following questions. a) What is the claim in this study? (1 mark) b) What is parameter? (1 mark) c) What are suitable variables in this study? (2 marks) d) What type of sample can be used? (1 mark) e) Is it dependent sample or independent sample? (1 mark) f) What is a suitable formula of test that can be applied? Explain the requirement for the test. (3 marks) g) What is general critical value that relate to test in part (f)