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  3. i especially only need b...

Question: i especially only need b...

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I especially/ only Need b)An accountancy firm specializing in the preparation of income tax returns is interested in comparing the quality of work at two of its regional offices. The firm will be able to estimate the proportion of erroneous returns by randomly selecting sample of tax returns prepared at each office and verifying the sample returns accuracy. Two independent simple random samples from the two offices provided the following information. Office 1 Sample size = 250 Number of returns with errors 35 Office 2 Sample size 300 Number of returns with errors 27 a) Construct a 90% confidence interval for the difference between the two population proportions. b) The firm wants to use a hypothesis to determine whether the error proportions differ between the two offices.

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