Q.6.2 The financial manager of a national warehouse chain has found from previous experience that 45% of clients pay by credit card, 35% 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: (8).
Payment Method |
||||
Credit card |
Account |
Cash |
Total |
|
Number of receipts |
500 |
315 |
185 |
1000 |
Using a 1% significance level, test whether the payment method pattern has changed.
observed frequencey, O | expected proportion | expected frequency,E | (O-E)²/E | ||
500 | 0.450 | 450.00 | 5.556 | ||
315 | 0.350 | 350.00 | 3.500 | ||
185 | 0.200 | 200.00 | 1.125 |
Ho: two variables are independent of each other
H1: two variables are not not independent to each other
chi square test statistic,X² = Σ(O-E)²/E =
10.181
level of significance, α= 0.01
Degree of freedom=k-1= 3 -
1 = 2
P value = 0.0062 [ excel function:
=chisq.dist.rt(test-stat,df) ]
Decision: P value < α, Reject Ho
Hence the payment method pattern has changed.
THANKS
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Q.6.2 The financial manager of a national warehouse chain has found from previous experience that 45%...
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