6. A study tests the effectivity of a detergent powder on 1 500 customers. It is effective for 1 200 participants. Find the experimental probability that the detergent powder is effective. A. 80% C. 70% C. 60% D. 50%​

Sagot :

The comparison of two independent population means is very common and provides a way to test the hypothesis that the two groups differ from each other. Is the night shift less productive than the day shift, are the rates of return from fixed asset investments different from those from common stock investments, and so on? An observed difference between two sample means depends on both the means and the sample standard deviations. Very different means can occur by chance if there is great variation among the individual samples. The test statistic will have to account for this fact. The test comparing two independent population means with unknown and possibly unequal population standard deviations is called the Aspin-Welch t-test. The degrees of freedom formula we will see later was developed by Aspin-Welch.

#☛answer☚

#☛mark as brainlest☚

#☛tama lahat yan☚

#☛hope it help☚

#☛carry on learning☚

#☛respect all moderator☚

#☛godbless☚

#☛pa heart☚

#☛pa rate 5☚