An article describes a study of 1000 men from Utah, Iowa and Florida. The men were asked about how many books they read per year when they were younger (in their 20's) and when they were older (in their 50's). In the press release, the researchers are quoted as saying

'Our study shows that men who regularly read books at any age have lower risk of cognitive impairment than those who don't read, but reading at age 20 is most important in preventing cognitive impairment.'

a) What is the population of interest?

b) Is the sample likely to be representative of the population of interest? Explain your reasoning.

Explain how you go your answer