f 1000 sales receipts from the last month produced the following results:                                                   Payment Method                                        Credit          Card        Account Cash      Total Number of receipts         525             295             180                  1000

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The financial manager of a national warehouse chain has found from previous
experience that 55% of clients pay by credit card, 30% pay on account, while
the remainder pay using cash. He wishes to know if this is still the case. A
random sample of 1000 sales receipts from the last month produced the
following results:

                                                  Payment Method
                                       Credit          Card        Account Cash      Total
Number of receipts         525             295             180                  1000                 

Using a 5% significance level, test whether the payment method pattern has
changed.

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