MCA Grade 8 Statistics and Probability Practice

What the test measures

Statistics and Probability skills

Investigate patterns of association in bivariate data
Construct and interpret scatter plots for bivariate measurement data
Informally fit a function to the data and interpret the slope and intercept of the model
Use lines of best fit to make predictions and assess fit

Standards basis

Minnesota Academic Standards in Mathematics (2007; assessed by MCA-III in grades 3-8 and 11 through 2026-27. 2022 standards phase in with MCA-IV beginning 2027-28) — Minnesota

How the MCA reports it

Minnesota’s MCA math is a state assessment tied to Minnesota Academic Standards in Mathematics rather than a separate national framework. The official public resources available here point to Minnesota-specific standards implementation, and absent a test blueprint, the coverage map should be organized by the state’s grade-level math domains that closely parallel CCSS-M. Note: the current MCA-III assesses the 2007 Minnesota standards in grades 3-8 and 11; Minnesota administers a single comprehensive high-school (grade 11) math test, NOT Algebra I / Geometry / Algebra II end-of-course exams — the 'High School / MCA EOC' band below is the grade-11 HS administration. (MCA-IV on the 2022 standards begins 2027-28.)

Blueprint & weighting

MCA uses the Independent / state-specific framework (by grade domains structure).

Official sources

Minnesota Department of Education MCA page
Minnesota Academic Standards in Mathematics implementation reference
MCA-III Mathematics Test Specifications, Grades 3-8 and 11

Practice by skill

Topics mapped to this domain

Scatterplots and trend lines

Grade 818 questions

Try it now

8 free questions · 0/0 correct

Practice playeasy

A trend line for hours studied $x$ and quiz score $y$ is $y = 4x + 62$ . What score does the line predict for a student who studies $3$ hours?

Substitute $x = 3$ : $y = 4(3) + 62 = 12 + 62 = 74$ .

Practice playeasy

A trend line predicts that a bakery will sell $75$ bagels on Monday. The bakery actually sells $79$ bagels. What is the residual (actual value minus predicted value)?

Residual $=$ actual $-$ predicted $= 79 - 75 = 4$ .

Practice playeasy

A line of best fit relating hours of practice $x$ to free throws made $y$ is $y = 6x + 10$ . According to the line, each additional hour of practice adds about how many free throws?

The slope of $y = 6x + 10$ is $6$ : the predicted change in free throws for each extra hour of practice.

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 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 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 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)?

Residual $= 21 - 18 = 3$ words.

Practice playeasy

A line of best fit for the number of lawns Jaden mows $x$ and his savings $y$ in dollars is $y = 15x + 40$ . According to the line, how many dollars did Jaden have saved before mowing any lawns?