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Woolworths South Africa analysed the value of purchases made on credit cards by ...
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Woolworths South Africa analysed the value of purchases made on credit cards by a random sample of n = 25 of their credit card customers. The sample mean was calculated at x̄ = R170, with a sample standard deviation of σ = R22. With 95% confidence, estimate the actual mean value of credit card purchases by all their credit card customers.
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