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.

What grade level is PS.DC.2.c taught?

This standard is part of the PS curriculum in Virginia Standards of Learning - Mathematics.

Are there practice problems for PS.DC.2.c?

Yes, there are 3 practice problems available for PS.DC.2.c with worked examples.

What learning resources are available for PS.DC.2.c?

There are 7 Khan Academy resources available for PS.DC.2.c, including 4 videos, 2 exercises, 1 articles.

PS.DC.2.c: Investigate and explain biased influences inherent within sampling methods and various forms of response bias.

Investigate and explain biased influences inherent within sampling methods and various forms of response bias.

Example Problems

A school chooses 3 randomly selected athletes from each of its sports teams to participate in a survey about athletics at the school.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?

An airline company wants to survey its customers one day, so they randomly select 5 flights that day and survey every passenger on those flights.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?

A delivery company evaluates service on a given day. It randomly selects 8 delivery routes that day and contacts every customer served on those routes.

What type of sample is this: simple random sample, stratified random sample, cluster random sample, or systematic random sample?

Khan Academy Resources

Identifying bias in samples and surveys Sampling method considerations Bias in samples and surveys Systematic random sampling Examples of bias in surveys Techniques for random sampling and avoiding bias Example of undercoverage introducing bias

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