Question

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

Answer 1

Answer:

- Random condition

- Independence condition

Step-by-step explanation:

We are told that she selects random samples of 12 batteries from one brand and random samples of 20 batteries from another brand before testing each of them.

In carrying t-test, the sample is required to be random, independent, not have outliers, exhibit normality e.t.c

Now, it is clearly stated that she selected them randomly, thus random condition is met.

Also, another condition we can deduce from her test is that the samples are independent as they don't depend on one another since they are of 2 different brands.

Thus, she meets 2 conditions which are Random condition & independence condition

Answer 2

Answer:

Random sample, individual (A and D)

Step-by-step explanation:

I did the Khan Acadmy