Why isn't it a population data?
I know it was mentioned in video that it's sample because it's the data for only 3 years. But when we are interested in a single year and have all the data from that year, doesn't that mean that we have population data?
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I think the database is considered as population data when all Target audience who we want to collect data are involved in the database. I think 1 year is not always enough to infer to the whole population as the data can be different from each year.
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can you explain why the last answer is the right one but not the first option???
Why the way of calculating STD error and STD error of difference is different?
Resolved: why do you need to divide standard deviation of sampling means by sqrt of sample size?