Experimental Design Basics Quiz with Answers

Question 1

A school wants to estimate the average number of hours students sleep per night. Which method is a **simple random sample (SRS)** of 50 students?

Accepted Answer

Write all student names on identical slips, mix thoroughly, and draw 50 names.

Answer

Ask each homeroom teacher to pick 5 students they think are typical sleepers.

Answer

Choose the first 50 students who enter the cafeteria in the morning.

Answer

Survey all students in one randomly chosen math class period until you reach 50.

Question 2

A scientist records people’s exercise habits and their blood pressure but does **not** assign anyone to exercise more or less. This is best described as:

Accepted Answer

An observational study

Answer

An experiment, because it studies cause and effect

Answer

A census

Answer

A randomized comparative experiment

Question 3

A school surveys only students who attend an after-school tutoring program to estimate the average math grade for the whole school. What type of bias is most likely?

Accepted Answer

Undercoverage bias (sampling a group that misses parts of the population)

Answer

No bias, because tutoring students are more informed

Answer

Response bias caused by students lying about their grades

Answer

Systematic sampling bias from choosing every $k$th student

Experimental Design Basics Quiz with Answers

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