A manager of a local retail store analyzes the relationship between advertising and sales by reviewing the store's data for the previous six months.

Advertising(in $100s) Sales(in $1,000s)

26 21

28 20

22 17

32 25

24 20

31 26

b.Calculate the standard deviation of advertising and the standard deviation of sales.(Round your answers to 2 decimal places.)

c-1.Calculate thecovariance between advertising and sales.(Round your answer to 2 decimal places.)

d.Calculatethe correlation coefficient between advertising and sales.(Round your answer to 2 decimal places.)