You draw a random sample of 300 employee records from the personnel file and find that the average length of service per employee is 6.3.

a Can you derive from this information how reliable the mean estimate is?

b What further information would you need to assess how reliable the mean estimate of 6.3 years is?

You are working for Kiddybooks, a small publisher of children books.
Although Kiddybooks children’s books have won many awards, the exposure of your books in book shops is shoddy. Book shops claim that despite the awards you have won parents are not demanding your books.
Apparently the relationship between awards for good books and sales of good books does not work in your case.
How could you investigate why the relationship between awards and book sales does not work for Kiddybooks? Formulate different research questions and identify the unit of analysis.