Are my answers here correct ?

Research questions for z test, t test for independent samples and t test for dependent samples :

z test: "An investigator is interested in finding out whether the particular sample of college students is similar to or different from college students in general.

t test for independent samples: "Do 11th graders have significantly more unexcused absences than 10th graders in junior highs?

t test for dependent samples: " Do people drop weight after attending a weight loss boot camp for 2 months?

Your answers are correct. The research questions provided for the z test, t test for independent samples, and t test for dependent samples accurately describe the purpose or objective of each statistical test.

Your answers appear to be correct. Each research question corresponds to the appropriate statistical test:

1. z test: The question involves comparing a specific sample to a general population. This is typically done using a z-test.
2. t test for independent samples: The question involves comparing two independent groups, such as two different grade levels, and determining if there is a significant difference between them.
3. t test for dependent samples: The question involves comparing the same group of individuals before and after a specific treatment or intervention, such as attending a weight loss boot camp, to determine if there is a significant difference in their weight.