## Answers

Let , be the population mean of the regular ATM users and be the population mean of the non-regular ATM users.

i) Hypothesis : Vs

ii) The test statistic is ,

Critical value :

Rejection rule : If , then reject the null hypothesis , accept otherwise

Decision : Here ,

Therefore , reject the null hypothesis

Conclusion : Hence , The managers of a regional bank in Florida believe that customers who regularly use their ATM cards are more profitable to the bank overall than those who do not regularly use their ATM cards.

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