8. When calculating the standard deviation, when would you use N in the denominator and when would you use n-1 in the denominator? Why do we use n-1 in the denominator?

9. Amanda Mabro, a coffee aficionado, wants to draw a sample of people in Montreal who own a Nespresso coffee maker. What type of sampling should Amanda use (i.e. how should she go about finding a sample of Montrealers who own a Nespresso machine)? Why?