Eira works for a consumer advocacy firm. She would like to determine whether there is a difference in the battery life of two different brands of batteries, each of which sells thousands of batteries per year. She obtains separate random samples of 121212 batteries from one brand and 202020 batteries from the other, then tests the amount of time each battery lasts. There are outliers in her data. Eira plans to use this information to perform a ttt test to determine whether there is a difference in the average battery life of the two brands. Which conditions for performing this type of test did Eira's samples meet