How to Use the Lab

Follow these simple steps to master every statistical topic with full control over your own data.

1

Choose Your Topic

At the top of the lab you will see tabs for different topics:

  • Mean, Median, Mode
  • Variance & Standard Deviation
  • Coefficient of Variation
  • Frequency Mean (with Class Limits)
  • Probability
  • Pearson Correlation

Click any tab to open that topic.

2

Enter Your Own Data

Every topic allows you to type your own numbers.

  • For Mean / Median / Mode / Variance → type numbers separated by space or comma
  • For Frequency → use format 0-10:4 10-20:6 20-30:8
  • For Correlation → use pairs like 2,3 4,5 6,7
  • For Probability → enter Favourable and Total outcomes

You can also click the Sample button to load example data.

3

Lock the Data

After typing your numbers, click the Lock Data button.

This freezes your data so the lab can use it for calculations and checks.

4

Select the Correct Formula

A list of formulas will appear. The real formula is hidden until you choose correctly.

Click the right option, then press Check Formula.

Only after a correct selection will the official formula be revealed.

5

Identify the Variables (where available)

Some topics (especially Mean) ask you to identify what each symbol means (Σx, n, etc.).

Select the correct meanings and click Check Variables.

6

Build the Working Ledger

This is the heart of the lab. You construct the solution step-by-step:

  • Mean → Add numbers one by one (previous result feeds the next row)
  • Median → Arrange numbers in ascending order by selecting values
  • Mode → Count the frequency of each value
  • Variance → Calculate (x − mean) then square each deviation
  • Frequency → Find mid-points and calculate fx
  • Correlation → Build X², Y² and XY for every pair

The computer only performs the arithmetic after you choose the operations.

7

Enter the Final Answer

After completing the working ledger, type your final numerical answer (Mean, Median, r, Probability, etc.).

Click Check Working & Answer to verify everything.

8

View the Complete Solution (Optional)

If you get stuck or want to confirm, click the green Show Solution button.

It will display the full step-by-step solution using your data.

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Pro Tip: Always try to complete the working ledger yourself before looking at the solution. The real learning happens when you construct the steps, not when you just see the final number.

Ready to practice? Open the Comprehensive Statistics Lab and start with any topic.