Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

S-IC.B.5

Use data from a randomized experiment to compare two treatments; use simulations to decide if differences between parameters are significant.

Example Problems

A smartphone manufacturer claims an average battery life of 10 hours on a standard test. A reviewer tests a random sample of 49 phones and finds a sample mean battery life of 9.3 hours with a sample standard deviation of 1.4 hours.

The reviewer wants to use these sample data to conduct a t test on the mean. Assume that all conditions for inference have been met.

Calculate the test statistic for their test.

A nutrition bar advertises 200 calories per bar on average. A consumer group suspects the mean is lower and tests a random sample of 9 bars, finding a sample mean of 193 calories with a sample standard deviation of 6 calories.

The group wants to use these sample data to conduct a t test on the mean. Assume that all conditions for inference have been met.

Calculate the test statistic for their test.

A call center monitors average call length, which is supposed to be

7 \text{ minutes}

. A supervisor thinks the mean has changed and takes a random sample of

25

calls, finding a sample mean of

6.6 \text{ minutes}

with a sample standard deviation of

1.0 \text{ minute}

.

The supervisor wants to use these sample data to conduct a t test on the mean. Assume that all conditions for inference have been met.

Calculate the test statistic for their test.

Khan Academy Resources

Interpret results of simulations Random numbers for experimental probability Statistical significance of experiment

1-on-1 AI tutoring aligned to S-IC.B.5. Instant help for students, real-time insights for teachers.

Used in classrooms by 100,000+ students at Baltimore County, Plano ISD, Deer Valley USD, KIPP, and districts nationwide.

Free for teachers, forever →