Free Printable WorksheetScienceGrade 8Science CurriculumSCI.8.15

8.15 Replication, Repetition and Sample Size Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.15 Replication, Repetition and Sample Size. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Replication, Repetition and Sample Size - Which option best distinguishes repeating trials within one investigation (repetition) from independent replication by other groups and explain why larger samples improve reliability? (SEP: Asking Questions/Defining Problems; Planning and Carrying Out Investigations; Developing and Using Models; Analyzing and Interpreting Data; Using Mathematics and Computational Thinking; Constructing Explanations/Designing Solutions; Engaging in Argument from Evidence; Obtaining/Evaluating/Communicating Information; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 8.15 Replication, Repetition and Sample Size skill assessments:

Problem 1Difficulty: Mastery

A lab compares two microscopy staining protocols. For each protocol, they stain one slide, then take 12 images from different fields of view on the same slide and score each image.

Which statement best distinguishes repetition from sample size?

AThe 12 images make the sample size 12 slides per protocol.

BBecause images are digital, each image is independent replication.

CTaking many images replaces the need for multiple slides.

DThe 12 images are repeated measurements within one slide (repetition); to increase independent sample size, the lab should stain multiple slides prepared from independent specimens for each protocol.

Solution & Explanation:Different fields of view on the same slide share the same specimen preparation. That’s repetition/subsampling within one slide. Independent slides/specimens provide true sample size and stronger replication.

Problem 2Difficulty: Mastery

A climate study uses one weather station to compare ‘before’ and ‘after’ a nearby forest is cut down. The station records temperature every hour for a year before and a year after. "

Which statement best characterizes the role of the hourly records?,A. The hourly records create a large sample size of weather stations. | B. The hourly records are independent replications of the deforestation event. | C. Hourly records are repetition (time-series repeated measures) at one station; stronger replication would include multiple independent stations or comparable control sites to separate deforestation effects from broader climate variation. | D. Because the time span is long

Solution & Explanation:repetition and sample size online practice | replication

Problem 3Difficulty: Mastery

A lab report compares bacteria growth at pH 6 and pH 8. The student used one culture tube at each pH and took OD readings every 15 minutes for 2 hours.

Which revision best adds repeating trials at the correct level?

ATake OD readings every 5 minutes instead of every 15 minutes.

BUse three independent culture tubes at pH 6 and three independent culture tubes at pH 8, each prepared separately, and then compare the average growth curves.

CUse a different brand of spectrophotometer for some readings.

DGraph the data with a smoother line.

Solution & Explanation:More frequent readings are more time points, not new trials. Multiple independently prepared culture tubes per pH add repetition/replication at the experimental-unit level and strengthen conclusions.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.15 (Explain how repeated trials, replication, and larger samples improve confidence in results.).