Eco-Fone 's two retail shops offer discounted mobile phones and accessories. Both shops have been running for several months and Eco-Fone now wants...

Eco-Fone's two retail shops offer discounted mobile phones and accessories. Both shops have been running for several months and Eco-Fone now wants to compare the net taking from both shops. A sample of 40 net daily takings from the first shop has a mean £100 and a standard deviation of £20. A sample of 40 net daily takings from the second shop has a mean of £90 and a standard deviation of £40. Are the two shops' net takings the same? Explain your findings