The supermarket manager is also interested to know if there is a difference in average shopping time for customers using the self-serve register and those using an assisted register.
Dependent variable: Shopping time = time customer takes on shopping at the supermarket.
Independent variable: Self-serve = 1 if customer used self-serve and O if assisted by registers
a) (i). Use Excel to produce a linear regression of the shopping time on self-serve variable.
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(ii) Use the output obtained in part (i) and carry out a hypothesis test at the 5% level of significance to determine if the average shopping time is less for the customers using selfserve than those using assisted registers.
(iii) What is a Type 1 Error in the context of this hypothesis test?
(iv) What is a Type II Error in the context of this hypothesis test?
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