Descriptive statistics are the focus of this Grade 7 Science worksheet resource, helping students interpret data using mean, median, mode, interquartile range (IQR), variance, and outliers. Designed for Ontario Science STEM Skills & Connections, the resource connects statistical vocabulary with practical scientific interpretation and repeated measurements.

From Data Summaries to Scientific Interpretation

Students begin with a reading passage that explains how scientists summarize data and distinguish measures of central tendency from measures of spread. They examine how the mean, median, and mode describe the center of a data set, while the IQR describes the middle 50%. The resource also introduces variance through squared deviations from the mean and explains why different statistics respond differently to extreme values.

Particular attention is given to outliers and data interpretation. Students consider why outliers can strongly affect the mean and variance while the median and IQR are often more resistant. They also connect statistical summaries to histograms and box plots, including how a box plot displays the median, IQR, and potential outliers.

Apply Statistics to Scientific Evidence

The resource extends descriptive reasoning into basic inferential ideas. Students consider how sample size and confidence influence the reliability of estimates, why small samples may produce more variable statistics, and how larger samples generally provide more stable estimates. They also compare results across experimental replicates to judge consistency, including whether means are close and IQR values are similar.

Learning is reinforced through multiple-choice questions, true-or-false statements, short-answer questions, matching, a cloze passage, an extended response, and a did-you-know section. The extended response asks students to interpret two sets of summary statistics by considering mean, variance, median, and IQR.

Included for Instruction and Review

• ✔️ Student worksheet focused on descriptive and basic inferential statistics
• ✔️ Separate PDF answer key
• ✔️ Student Notes & Lesson Summary supplement
• ✔️ Separate Teacher Guide with learning objectives, teaching tips, discussion questions, and common mistakes

Use this Grade 7 Science statistics practice for classroom instruction, independent work, review, or STEM skills reinforcement. Its combination of direct definitions, scientific scenarios, data interpretation, and written reasoning gives students opportunities to use statistical concepts rather than simply memorize terminology.