Constructing Confidence Intervals

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Constructing Confidence Intervals

Refer to the Excel file Pallet (attached to the assignment) to address all the questions below:

The file contains the weight in pounds from a sample of 368 pallets of Boston shingles and 330 pallets of Vermont shingles.

  1. For the Boston shingles, construct a 95% confidence interval for the mean weight.
  2. For the Vermont shingles, construct a 95% confidence interval estimate for the mean weight.
  3. Do you think the assumptions needed to construct the confidence interval estimates in 1 and 2 are valid?
  4. Based on the results of 1 and 2, what conclusions can you reach concerning the mean weight of the Boston and Vermont Shingles?

Refer to the Excel file InsuranceClaims for the assignment below:

The files contains data for 90 randomly selected auto injury claims.

  1. Construct a 95% confidence interval for the population proportion of all auto injury files that have exaggerated loss amounts.
  2. Construct a 95% confidence interval for the population mean dollar excess payment amount.

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