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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?
Yes, your research questions for z test, t test for independent samples, and t test for dependent samples are correct. Here's how to get these answers:
Z Test: To conduct a z test, you would need to collect a sample of college students and compare their characteristics to the characteristics of a larger population of college students. You would calculate the z statistic, compare it to the critical value for your desired level of significance, and determine whether the sample is statistically different from the population.
T Test for Independent Samples: To conduct a t test for independent samples, you would need to collect data from two groups (in this case, 10th graders and 11th graders in junior highs) and compare their mean unexcused absences. You would calculate the t statistic and compare it to the critical value for your desired level of significance to determine if there is a significant difference between the two groups.
T Test for Dependent Samples: To conduct a t test for dependent samples, you would need to measure the weight of individuals before and after attending a weight loss boot camp. You would calculate the differences between the two measurements and perform a t-test on those differences to determine if there is a significant change in weight after attending the boot camp.