if a customer whose oil was changed every 24 months had instead changed it every

Question

if a customer whose oil was changed every 24 months had instead changed it every 18 months, would the sample variance increase or decrease? Why? If instead of every 24 or 18 months, the customer had changed the oil every 6 months, how would the resulting sample variance compare to the sample variance when the oil was changed every 24 months? Every 18 months? sorry, you're measuring the time it takes to change the oil. if a customer whose oil was changed every 24 months had instead changed it every 18 months, would the sample variance increase or decrease? Why? If instead of every 24 or 18 months, the customer had changed the oil every 6 months, how would the resulting sample variance compare to the sample variance when the oil was changed every 24 months? Every 18 months? sorry, you're measuring the time it takes to change the oil.

Explanation / Answer

You don't really say what you are measuring, but the longer you wait between oil changes, the longer whatever you are measuring would have time to build up (or degrade), so I would assume the variance would be larger the more time you wait between changes.

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