The ____________ is a hypothesis-testing procedure in which there are two separate groups at people tested and the population variance is not known.
- t test for dependent means
- t test for a single sample
- t test for independent means
- t test for repeated measures
To quote one of our very good math and science tutors: “You will find here at Jiskha that long series of questions, posted with no evidence of effort or thought by the person posting, will not be answered. We will gladly respond to your future questions in which your thoughts are included.”
The correct answer is the "t test for independent means".
To arrive at this answer, you can break down the information provided in the question:
1. "Hypothesis-testing procedure": This indicates that we are looking for a statistical test used to test hypotheses.
2. "Two separate groups of people tested": This suggests that the test involves comparing two different groups.
3. "Population variance is not known": This implies that we do not have information about the variance of the population from which the samples are taken.
Based on these clues, you can determine that the appropriate test is the "t test for independent means". This test is used when comparing the means of two independent groups, typically when the variances of the populations are not known.