Question 215 mariss This question is basied on your work on MUI:3 up to and inchaling Unit 6 . (a) Describe ln your own words how you wotdd expect the data points on a scatterplot to be distributed (how they would look oa a scatterplot) if the following features were present. (i) A potential outlier (ii) A strong negative correlation between the x and y variables (iii) A correlation coefficient of t=0.1 (b) This question investigates the relationship between the time taken to upload a file to the eTMA system and the closenese to the cut-off deadline. A sample of 20 students who traditionally submit their eTMLs within the final hour were asked to reoord their 'time of Wahmission' as the number of mimutes before the eut-off deadline, and to record the time taloen to uploal their eTMA file in seconds. The results were displayed on a seatterplot with the regression line inchaded. The time of sabmission was displayed on the horizontal axis and the time taken to upload the file was displayed on the vertical axis. (i) The regresion line for the inveatigition is y=0.36x+19.93. (1) What does the variable x represent here? (2) What does the variable y reprenent hure? (ii) The correlation coeflicient r for the investigation is 0.94. What does this tell you about the relationship between x and y ? (iii) Use the regression equation from part (b) (i) to predict the time it takes to uplond a file subenitted 25 minutes before the cut-off deadiline. Give your ansuer to the nearest whole second. (iv) Can you conclude from this invetigation that aubmiseion times cloeer to the deadline cause the time to upload a file to increase? Explain your answer. Question 3 - 5 marls This queation is basad on your wonk on MUt 99 ap to and including Unit 7. Maloe k the subject of the following two equations. Sbow each step of your working. (a) 7t35k+8 (b) 6k=4t9k+11t