Preeti and Nik own a nail bar. They have a list of 342 customers.
They want to find out their customers' views on their prices, products and opening hours.
a What is the population for this survey?
b Preeti suggests they take a random sample of 20 customers.
Nik suggests they take a random sample of 40 customers.
Which size sample would give the most representative results for the population?
c 38 customers answer the question
'How much, on average, do you spend on your nails each month?'
The mean amount for these customers is £26.50.
The nail bar sees around 200 customers each month.
Estimate the total amount 200 customers would spend in a month.
What assumptions have you made?