Some accounting firms give the client an option to pay an additional fee when doing...

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Accounting

Some accounting firms give the client an option to pay an additional fee when doing their tax return, that guarantees company support should the client be audited. A large accounting firm would like to update their fee for this type of service. In previous years, the average cost to the firm for being involved in a client audit was $680. To determine if this cost has changed, the firm randomly samples 32 clients who got audited. The average audit cost for this sample of clients was $713 with a standard error of $15.20.
(a) Compute a 90% confidence interval for the true average involvement cost for all client audits for this company: (Use 4 decimals.)
($
,$
)
(b) Based on the above interval, should the firm conclude the average audit involvement cost is different than $680?
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, there is
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evidence the true average cost is
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$680, with 90% confidence

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