KSA Data Analysis & Reporting 5

Question 1

Which sampling method gives every member of the population an equal chance of selection?

Accepted Answer

Simple random sampling

Answer

Simple random sampling ensures equal selection probability and reduces selection bias.

Question 2

What is the main risk of reporting only averages for a skewed dataset?

Accepted Answer

The mean may misrepresent the typical case

Answer

In skewed distributions the mean is pulled toward the tail and may not reflect typical values.

Question 3

In a KSA narrative, which opening sentence for an analysis example is strongest?

Accepted Answer

As a program analyst, I analyzed 3 years of claims data to cut processing time by 18%.

Answer

A specific role, task, and quantified result convey demonstrated competence.

Question 4

Which tool is most appropriate for automating a repetitive data cleaning task across thousands of rows?

Accepted Answer

A script or macro (e.g., Python, R, VBA)

Answer

Scripting reduces errors and time on repetitive transformations and is repeatable.

Question 5

A Type I error occurs when you:

Accepted Answer

Reject a true null hypothesis

Answer

A Type I error is a false positive: rejecting a null hypothesis that is actually true.

KSA - Knowledge, Skills, and Abilities Practice Test