11. A group of data-entry clerks had the following results in a keyboarding test: Speed (words/min) 44 62 57 28 46 71 50 Number of Errors 3 3 5 11 2 14 a) Create a scatter plot and classify the linear correlation. b) Determine the correlation coefficient and the equation of the line of best fit. c) Identify the outlier and repeat part b) without it. Use calculations and a graph to show how this affects the strength of the linear correlation and the line of best fit. d) What does your analysis tell you about the relationship between speed and accuracy for this group of data-entry clerks? 12. A shopper observes that whenever the price of butter goes up, the price of cheese goes up also. Can the shopper conclude that the price of butter causes the increase in the price of cheese? If not, how would you account for the correlation in prices? 13. A market research company has a contract to determine the percent of adults in Ontario who want speed limits on expressways to be increased. The poll's results must be accurate within 24%, 19 times in 20. a) If a small initial sample finds opinions almost equally divided, how many people should the company survey? b) Suggest a sampling method that would give reliable results. 14. How many ways can a bank of six jumpers on a circuit board be set if a) each jumper can be either on or off? b) each jumper can be off or connect either pins I and 2 or pins 2 and 3