If You Wish to Test Whether Two Population Means Are

question 4

Multiple Choice

If you wish to test whether two population means are equal using a two-sample t test with a pooled estimate of the common variance, which of the following assumptions is NOT true?

• A) The population variances should be equal or nearly equal.
• B) The two samples must be independent of each other.
• C) The two samples sizes are small and the samples must be randomly selected from the populations.
• D) The populations from which the samples are drawn must be t distributed.

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Definitions:

Progressive Tax

A tax system where the tax rate increases as the taxable amount increases, often aimed at reducing income inequality.

Tax Base

The tax base is the total amount of assets or revenue that a government can tax, including income, property, sales, and other valuables.

Marginal Tax Rate

The rate at which the next dollar of taxable income is taxed.

Proportional Tax

A tax system where the rate of taxation is fixed, meaning the tax rate stays the same regardless of the taxable amount or income.