CRA Data Collection & Analysis 2

Question 1

Which type of measurement scale has a true zero point, allowing meaningful ratio comparisons?

Accepted Answer

Ratio

Answer

Ratio scales have a true zero point, enabling statements like 'twice as much,' unlike interval scales which lack a meaningful zero.

Question 2

A researcher wants to collect data from every tenth person on a list. This technique is called:

Accepted Answer

Systematic sampling

Answer

Systematic sampling selects every nth element from a list, providing a structured and efficient probability-based approach.

Question 3

In a research dataset, an outlier is best described as:

Accepted Answer

A value that falls far outside the typical range of observations

Answer

Outliers are data points that deviate markedly from the overall pattern and can distort statistical analyses if not properly addressed.

Question 4

Which statistical test is most appropriate for comparing means across three or more independent groups?

Accepted Answer

One-way ANOVA

Answer

One-way ANOVA compares means across three or more independent groups while controlling the Type I error rate better than multiple t-tests.

Question 5

The Hawthorne Effect refers to participants changing their behavior because:

Accepted Answer

They know they are being observed

Answer

The Hawthorne Effect occurs when participants alter their behavior simply due to awareness of being observed, introducing a form of response bias.

(CRA) Certified Research Associate Practice Test