In checking the reliability of a bank's records, auditing firms sometimes ask a sample of the bank's to confirm the accuracy of their savings account balances as reported by the bank. Suppose an auditing firm is interested in estimating the proportion of a bank's savings account on whose balances the bank and the customer disagree. Of 200 savings account customer questiomed by the auditors, 15 of them said their balance disagreed with that reported by the bank. The bank claims that the true fraction of accounts on which there is disagreement is at most 0.05: You as and auditor doubt this claims. Test the bank's claim at 0.10 significance level. Z0.1=1.28, Z0.05=1.645
在檢查銀行記錄的可靠性時，審計公司有時會要求銀行提供樣本以確認其所報告的儲蓄帳戶餘額的準確性。 假設審計公司有興趣估計銀行的儲蓄帳戶中，銀行與客戶的餘額不一致所佔的比例。 在審計師要求的200個儲蓄帳戶客戶中，有15個客戶說他們的餘額與銀行報告的餘額不同。 銀行宣稱，存在爭議的帳戶的比例最多為0.05：您和審計師對此說法表示懷疑。 在0.10的顯著性水平下檢定銀行宣稱的說法。 Z0.1 = 1.28，Z0.05 = 1.645
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