Month 8 · Define metrics with denominators
Four relative self-study weeks with fictional aggregate data and one monthly activity. No live analytics, business promises or payment calculations without evidence.
This is the developed Month 8 learning resource, not the entire twelve-month course. The four exercises form one monthly activity M08. Reading, personal marks and self-scores do not verify academic completion.
Complete fictional source F8 — week W8
These are all supplied counts for one fictional week. No actual dates, people, message log, amounts, linked event histories or payment data are provided.
| Event | Count | Interpretation limit |
|---|---|---|
| Distinct inquiries | 20 | Not established unique people |
| Responses | 15 | Not satisfaction |
| Proposals | 8 | No individual links supplied |
| Confirmed orders | 4 | Not payments |
| Payments and amounts | Not supplied | Not zero; no revenue/profit |
Separate complete test variants: V8A inquiries20/responses0; V8B proposals0/orders4; V8C original F8 with payment information still absent. Never combine these tests into a report of actual periods.
Week 1 · Define events and period
Goal: Understand what each number counts before dividing.
A metric answers a bounded question. F8 summarizes fictional week W8: twenty distinct inquiries, fifteen responses, eight proposals and four confirmed orders. Payments are not supplied. These are different events; an order is not collected revenue and a response does not necessarily represent a unique person.
The denominator defines the comparison base. Four orders is a count; four orders over twenty inquiries is a relationship. Fifty percent without a stated base leaves interpretation open. Record event name, unit, period and source beside every number before writing the report.
F8 provides aggregate totals, not individually linked records proving which proposal produced an order. Exercise ratios describe totals; they establish no individual journey, causation or guarantee that all orders came from the eight proposals. Never invent a perfect funnel or customer identities to fill that gap.
Case for review
A report says: “Twenty customers, fifteen satisfied and four payments this week.”
Your activity
Check the three labels against F8. Build a dictionary of event, supplied definition, unit, period and unknown information. Preserve source names.
Worked feedback — compare after trying
F8 says distinct inquiries, not twenty people; responses, not satisfaction; confirmed orders, not payments. The period is fictional W8 without real dates. Amounts, identities, satisfaction and individual links are unknown. Correct labels and retain limits.
Supporting artifact 1: F8 dictionary and three label corrections.
Week 2 · Calculate three different ratios
Goal: Show numerator, denominator and an independent check.
To express a ratio as a percentage, divide numerator by denominator and multiply by one hundred. Response/inquiry uses fifteen over twenty. Order/inquiry uses four over twenty. Order/proposal uses four over eight. Same week, different questions.
Cross-check: fifteen of twenty equals three quarters, or seventy-five percent. Four of twenty is one fifth, or twenty percent. Four of eight is half, or fifty percent. Do not change the base to improve appearances or choose the highest percentage as a summary of the whole business.
A precise label states base event and period, such as “confirmed orders / proposals, W8”. Avoid undefined success or guaranteed conversion. These are descriptive practice calculations, not actual APEX results or campaign forecasts.
Case for review
Two cards show20% and50% under the same title “sales” despite different bases.
Your activity
Show fraction, decimal and percentage for each ratio. Write a complete label and interpretation. Explain why20% and50% do not conflict.
Worked feedback — compare after trying
15/20=0.75=75% responses/inquiries. 4/20=0.20=20% orders/inquiries. 4/8=0.50=50% orders/proposals. Denominators differ. None proves payment or profit; individual conversion would require linked records and further definitions.
Supporting artifact 2: checked calculations, labels and limits.
Week 3 · Handle zeros, missing values and comparison
Goal: Avoid invalid division and unsupported conclusions.
Zero is different from missing. A zero numerator with a positive denominator can yield zero. With a zero denominator, do not divide: report not calculable on that base. Never replace absent information with zero. These cases communicate different limitations and require different clarifications.
V8 variants are separate tests, not extra weeks to combine. V8A keeps twenty inquiries and changes responses to zero. V8B supplies zero proposals and four orders. V8C retains F8 while payments remain absent. Test the logic instead of inventing events to repair discrepancies.
Comparing periods requires compatible definitions and base sizes. A higher ratio alone proves no improvement caused by a tool. There is one base week and hypothetical variants, not a time series, experiment or comparison group. Calculate no growth and attribute no results to AI.
Case for review
A template changes missing payments to zero and divides four orders by zero proposals.
Your activity
Classify the V8A/B/C questions as calculable, not calculable or missing data. State the question and necessary non-personal clarification.
Worked feedback — compare after trying
V8A response/inquiry:0/20=0%. V8B order/proposal:4/0 is not calculable; review definitions and base instead of inventing100%. V8C collected revenue remains unknown without payments and amounts. No valid comparison means no growth or causal effect to report.
Supporting artifact 3: exception matrix and clarification questions.
Week 4 · Communicate and assemble M08
Goal: Present reproducible figures without implying real business results.
A useful summary gives source and period before interpretation. Include original counts and three ratios with their bases. A compact table can outperform a decorative chart. Any proposed chart must preserve denominators and avoid relabeling orders as revenue.
Record draft corrections: for example “replaced sales 50% with orders/proposals50%, W8” and “removed income because no payments or amounts are supplied”. Keep F8 intact and calculations in a copy. Connect no advertising accounts, real CRM or customer spreadsheets to complete this exercise.
Combine four supporting artifacts into one M08 activity. Approved rubric v1: facts/sources, artifact/process, data/human review and reasoning/limits, each0–2. Zero absent/wrong, one partial, two sufficiently justified. Minimum 6/8 without zeros requires authorized human review, never page-generated approval.
Case for review
A report concludes: “AI produced 50% sales and improved profit”, without comparison or payment information.
Your activity
Replace the claim with two descriptive W8 sentences. Attach source, calculations, exceptions, changes and justified self-review. List metrics that cannot be calculated.
Worked feedback — compare after trying
Possible summary: “W8 records 20 inquiries, 15 responses, 8 proposals and 4 confirmed orders. Ratios are 75% response/inquiry,20% order/inquiry and50% order/proposal; they establish no payments, income, profit or AI effect.” A 6/8 self-score without zeros may be reviewed;6/8 with a zero fails. No statements or benefits.
Single M08 submission: bounded summary, calculations, exceptions and traceable self-review.
Assemble your single monthly package
Download M08 package guide (TXT)
Keep your work locally. Formal review requires actual artifacts and an authorized human reviewer. No certificate, enrollment or benefit is issued by this page. The other eleven months and final portfolio remain separate parts of the annual program.
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