NJSLA Grade 8 Statistics and Probability Practice

What the test measures

Statistics and Probability skills

8.SP.A.1 Construct and interpret scatter plots for bivariate measurement data
8.SP.A.2 Know that straight lines are widely used to model relationships between two quantitative variables
8.SP.A.3 Use a linear model to fit data and assess the model fit
8.SP.A.4 Interpret the slope and intercepts of a linear model in the context of the data

Standards basis

New Jersey Student Learning Standards for Mathematics (NJSLS-M), aligned to Common Core State Standards for Mathematics (CCSS-M) — New Jersey

How the NJSLA reports it

NJSLA math is built on the New Jersey Student Learning Standards for Mathematics, which closely follow the Common Core domain structure and progressions. The assessment is organized by grade-level and end-of-course reporting aligned to those standards rather than by a separate proprietary framework.

Blueprint & weighting

NJDOE publishes statewide assessment administration information and grade/course coverage, but no official public math-domain weighting blueprint was located in the retrieved primary materials.

Official sources

New Jersey Department of Education - Assessment
New Jersey Department of Education - 2023 NJSLS-Mathematics
NJDOE - Statewide Assessment Testing Schedule 2026-27

Practice by skill

Topics mapped to this domain

Scatterplots and trend lines

Grade 818 questions

Two-way tables

Grade 815 questions

Try it now

8 free questions · 0/0 correct

Practice playeasy

A trend line for the daily high temperature $x$ in degrees and cups of lemonade sold $y$ is $y = 2x - 60$ . For a predicted $100$ cups sold, what should the temperature be?

Solve $100 = 2x - 60$ : $2x = 160$ , so $x = 80$ degrees.

Practice playeasy

A two-way table has rows Dog/Cat and columns Boys/Girls: Dog&Boys=10, Dog&Girls=6, Cat&Boys=5, Cat&Girls=9. How many were surveyed in total?

Add all cells: $10+6+5+9=30$ .

Practice playeasy

A trend line for the number of car washes a club holds $x$ and the club's funds $y$ in dollars is $y = 75x + 120$ . According to the line, how many dollars did the club have before holding any car washes?

At $x = 0$ , $y = 120$ dollars: the $y$ -intercept is the starting amount.

Practice playeasy

A two-way table has rows Dog/Cat and columns Boys/Girls: Dog&Boys=10, Dog&Girls=6, Cat&Boys=5, Cat&Girls=9. How many chose Dog in total?

Row total for Dog: $10+6=16$ .

Practice playeasy

A trend line for miles jogged $x$ and calories burned $y$ is $y = 90x + 20$ . How many calories does the line predict for a $4$ -mile jog?

$y = 90(4) + 20 = 360 + 20 = 380$ calories.

Practice playeasy

A two-way table has rows Dog/Cat and columns Boys/Girls: Dog&Boys=10, Dog&Girls=6, Cat&Boys=5, Cat&Girls=9. What fraction of all surveyed were Dog and Boys? Simplify.

$\dfrac{10}{30} = \dfrac{1}{3}$ .

Practice playeasy

A trend line predicts Mia will spell $18$ words correctly in a spelling bee. She actually spells $21$ words correctly. What is the residual (actual minus predicted)?