Module 06 Activity

Scenario

Your charts assert differences between groups. This activity checks whether the data supports them.

What you build

A distribution set that shows spread rather than asserting it, with sample sizes visible.

Steps

1. For every mean you chart, also compute the median, the range and the spread. Flag any group where the mean describes nobody.
2. Rebuild one histogram at four bin widths and say whether the conclusion is stable across them.
3. Take one box plot and overlay the points. Report anything the box hid.
4. Replace one two-bar comparison with a plot of the points, and report the overlap between the groups.
5. Compute the confidence interval for every category and add it, or add the sample size where you cannot.
6. Identify the category with the fewest observations and say whether any decision rests on it.

Evidence to hand in

• Mean, median, range and spread per group, with any flagged.
• The four bin widths and your stability judgement.
• The box plot with points overlaid, and what was hidden.
• The points plot with the overlap reported.
• Intervals or sample sizes on every category.
• The smallest category and what rests on it.

Review checklist

• Every charted mean is accompanied by a spread measure.
• The bin-width conclusion was checked across several widths.
• At least one box plot has its points overlaid.
• Every category carries a sample size or an interval.
• The smallest category is identified and what rests on it is stated.

Mark complete