If a sample size of 16 yields an average of 12 and standard deviation of 3, estimate the 95% confidence interval for the population (assume a normal distribution) . 
Definitions:
Service Cost
The portion of the pension expense that is recognized for the increase in pension benefits related to employee services of the current period.
Unrecognized Prior Service Cost
Costs not immediately recognized on the income statement related to retroactive benefits granted to employees in a pension plan amendment.
Straight-Line Method
A depreciation method that allocates an equal amount of depreciation each year over the useful life of the asset.
Defined Benefit Pension Plan
A type of pension plan where an employer commits to pay a specified pension amount to the retiree, based on factors like salary history and duration of employment.
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