When Testing the Difference Between Two Population Means Under Independent

question 30

Multiple Choice

When testing the difference between two population means under independent sampling, we use the z distribution if ________.

• A) the population variances are known
• B) the population variances are unknown, but assumed to be equal
• C) the population variances are unknown and cannot be assumed equal
• D) Both the population variances are known and the population variances are unknown, but assumed to be equal

---

Definitions:

VLOOKUP

A function in spreadsheet programs that searches for a value in the first column of a table array and returns a value in the same row from a specified column.

AND

A logical operator that yields true only if all the operands or expressions being compared are true.

Clustered Column Chart

A type of bar chart that groups related data bars together to facilitate comparison across categories.

Stacked Column Chart

A graphical representation of data where different values are stacked on top of each other in columns, showcasing parts of the whole.