Descriptive statistics
Center, spread, shape, outliers, and choosing the right display for a data set.
Statistics & data analysis tutoring
Online Statistics Tutor: from AP Stats to college data analysis.
In statistics, it matters what a number means as well as how it was calculated. Northstar teaches the reasoning behind each test and interval so students can interpret results and defend their conclusions.
$50 / 60 minutes · No long-term commitments · No required prepaid packages · 12-hour cancellation policy
What we cover
What statistics sessions can cover
Probability
Rules of probability, conditional probability, independence, and random variables.
Distributions
Normal, binomial, and sampling distributions, and the central limit theorem.
Inference
Confidence intervals, hypothesis testing, p-values, and interpreting results correctly.
Regression & correlation
Least-squares regression, residuals, correlation, and what the model does and doesn't say.
AP & college coursework
AP Statistics exam preparation and support for university statistics and data analysis courses.
Joshua’s statistics and data background
Northstar was founded by Joshua Lizardi, who holds an M.S. in Applied Mathematics, an M.S. in Data Analytics, a B.S. in Mathematics, and a Graduate Certificate in Applied Statistics, with 9+ years of teaching mathematics, including college and graduate-level instruction.
- Live one-to-one sessions through Zoom
- $50 per 60-minute session
- No long-term commitments or required prepaid packages
- 12-hour cancellation policy
- Flexible scheduling
- Payment through Zelle
Family cancellation policy, effective November 1, 2026
Cancel or reschedule with at least 12 hours' notice without charge. With less notice, the full $50 session fee may be charged. Student no-shows are generally charged the full scheduled fee. If Northstar cancels, you are not charged; any payment collected for that session is refunded or credited as appropriate. Rescheduling depends on mutual availability. Previously agreed individual exceptions are honored, and this policy does not apply to earlier sessions.
Private tutoring is $50 per 60-minute session. Invoices are typically issued after 4 tutoring sessions and paid through Zelle. Late-cancellation or no-show fees may appear on an invoice. No required prepaid packages or long-term commitments.
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