two retail shops offer discounted mobile phones and accessories

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 deviationof £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? Using the 5% level of significance, explain your findings.

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