Did easier registration improve warranty records?
Study design
Sample registrations from both form designs. Independently reconcile each record to an invoice and device serial number.
Instrument and data fields
Record form type, record validity, duplicate serial, invoice match and time to resolve a subsequent claim.
Simulated evidence
In samples of 100 records, 86 simplified registrations and 94 current forms were valid. Total registrations were 570 and 430 respectively.
Check before drawing a conclusion
Write down the comparison you would make and the unit each row represents. Identify one explanation the study design cannot rule out, then describe how it would affect the decision.
Reveal the worked analysis
Applying the sampled validity rates gives approximately 490 valid simplified records versus 404 current records. Adopt only with a duplicate check and confirm that valid records speed claims.
Extrapolation assumes sampled records represent their form types. Duplicate rates may vary by dealer or installation day.