GIVE TYPED WRITING SO I CAN UNDERSTAND CLEARLY.

IF YOU CANNOT TYPE,PLEASE PROVIDE NEAT AND CLEAR HANDWRITING.DO NOT GIVE BLUR AND CLUMSY WRITING.IT IS HARD FOR ME TO UNDERSTAND.

Kindly give accurate and correct answers.Kindly give step by step working.Do not skip steps. Mention and be very clear about the formula and conversion

.Then,explain to support and prove the working and answers.I do not really understand.I hope you can help me to understand.Explain how you get the answers and about each working.

STA JUNE 2019

QUESTION 4 a) One end, A of an elastic string was attached to a horizontal bar and a mass, m grams was attached to the other end, B. The mass was suspended freely and allowed to settle vertically below A. The MINITAB output on mass (in gram) and length (in mm) is shown below. Regression Analysis: length versus mass Predictor Coel SK Coel P Constant 210.600 4. 067 51.78 0.000 0.15257 0. 01044 14.61 10.000 5 - 4.36872 R-Sq - 98. 21 R-Sqladj) - 97.78 1) Identify the independent and dependent variables. State the coefficient of determination. Interpret the value. Write the estimated regression equation. iv) Interpret the gradient and the intercept of the regression equation line. v) Estimate the length of the string when a mass of 360 grams is attached at B. (10 marks) b) The table below shows the age of buyer and the total amount of natural health food purchased (in RM): Age 43 29 81 77 54 80 73 68 38 Total 40 120 18 34 25 54 71 90 58 12 amount Construct a scatter plot for the above data. Calculate the Pearson product moment correlation coefficient and interpret its meaning. (7 marks)QUESTION 8 The continuous random variable X has the probability density function x -1, 1 (4 marks) b) Calculate the mean of X. (4 marks) c) Find the variance of X. (6 marks)