4. Imagine that the Consumer Price Index for Canada in 2020 was 102.6. Assume a base year was established in 2006. a) What can you conclude about prices in Canada in 2020? (1 mark) b) If a set of tires cost $440 in 2006, how much would the same set of tires cost (approximately) in 2020?

19. The information in the following table shows the amount of sales and the profit from a small retail business in Whitby Ontario for the last 15 years. The years have not been provided as you will only need the amounts. Sales ($) (thousands)-

195, 205, 225, 240, 255, 300, 265, 345, 295, 335, 380, 405, 355, 390, 410 ; profit ($) (thousands)- 10, 15, 22, -10, 25, 39, 24, 55, 32, 37, 48, 55, 50, 48, 55

a) Enter the data from the table into a spreadsheet program. Include the headings for the two columns. (3 marks)

b) Sort the data from smallest to largest in the sales column. (2 marks)

c) In an empty cell below the profit column, show the sum of the profit column. (1 mark)

d) Create a scatter plot for this data. (2 marks)

20. The following information on age and number of hours exercised was gathered about 13 members at a small gym. Age- 25, 36, 44, 22, 57, 25, 43, 19, 33, 40, 44, 28, 25,

Hours- 6, 5, 4, 6.5, 2, 5, 4, 7, 4.5, 3, 2.5, 6.5, 5.5,

a) Create a scatter plot. (3 marks)

b) Determine the correlation coefficient. (2 marks)

c) Describe the type of relation and the strength of the relation. (2 marks)

d) Does the age of a gym member affect the number of hours that he or she exercises per week? (2 marks)

e) How reliable and valid do you think the information is? (2 mark