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What situation is an example of an observational study

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.