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While what you describe involves a comparison, it would not involve two samples of at least 30 observations. There is data on all cars by category. I think if you choose the category with the most types of cars in it you could do a study like the averag
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Do Apparel Stores Have a Higher Return on Equity (ROE) than Department Stores?
My population is the return on equity in all years for all apparel stores and return on equity in all years for all department stores. The parameters are the mean return on equity for all apparel stores and the mean return on equity for all department stores. The samples are 51 apparel stores and 30 department stores from Yahoo Finance on November 6, 2013. I eliminated stores for which Yahoo did not have a ROE or that had negative ROE. The statistics are the mean return on equity for 51 apparel stores which was 19.30and the mean return on equity for 30 department stores which was 16.47%.
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