Concerning Inference on Two Independent Population Means, the Pooled Variance

question 6

Multiple Choice

Concerning inference on two independent population means, the pooled variance estimate is:

• A) a way of estimating variance that relies on the information provided by only one of the samples.
• B) an unbiased estimator of the parameter .
• C) a combined (using a weighted average) estimate for the unknown variance of two populations.
• D) a less efficient but easier way of estimating population variances as compared to using two separate variance estimates (one for each population).

---

Definitions:

Merit Rating

A system of evaluating employees or operations based on performance, often utilized in determining pay raises or operational improvements.

FICA Taxes

Taxes imposed on both employees and employers to fund Social Security and Medicare, based on a percentage of the employee's earnings.

Social Security

A government program that provides financial assistance to people with insufficient or no income, including retirees, disabled individuals, and survivors.

Medicare Taxes

Taxes collected from employees and employers to fund the Medicare program, which provides health insurance for Americans aged 65 and older, and for some younger people with disability.