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.

HS.D.2.k

Understand what constitutes statistical significance. Interpret statistical significance in the context of a situation and answer investigative questions appropriately.

Example Problems

Roshanda suspects that teachers in her state, on average, have less than 5 years experience. She wants to take a random sample of teachers to determine if there is convincing evidence to support her suspicion.

Let

\mu

represent the average years of experience for teachers in Roshanda's state.

State the null hypothesis,

H_0

, for Roshanda's significance test.

A delivery company previously had 25% of shipments arrive late. After routing changes, they test

H_0: p = 0.25

versus

H_a: p < 0.25

, where

p

is the proportion of late shipments with the new system.

They take a random sample of 160 shipments and find that 32 arrived late.

Write the expression for the P-value of their test.

A manufacturer historically had 12% of items fail final inspection. After process improvements, they want to test

H_0: p = 0.12

versus

H_a: p < 0.12

, where

p

is the proportion of items that fail after the change.

They inspected a random sample of 120 items and found that 9 failed.

Write the expression for the P-value of their test.

Khan Academy Resources

Statistical significance of experiment

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