1. z test

2. t test for independent samples, and
3. t test for dependent samples

Hi! I really need help with this statistics. Its just that you suggest one psychological research question that could be answered by each of the following types of statistical tests above. Im so confused ! Hopefully, you could help :)) Thank youuu

Usually you use z-tests when sample sizes are large (n is greater than

or equal to 30) whether or not you know the population standard deviation.

If you do not know the population standard deviation and have a small
sample (n < 30), then you can use t-tests.

T-tests for independent samples uses two different sets of research subjects. T-tests for dependent samples uses the same research subjects in two different conditions (like a "before" condition and an "after" condition) or when there are two samples that have been matched or "paired" in some way.

You can find examples of these types of tests online or in any statistics textbook.

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?

Suggest one psychological research question that could be answered by each of the following types of statistical tests:

z test
t test for independent samples, and
t test for dependent samples

Of course! I'd be happy to help you understand these statistical tests and provide you with some example research questions for each test:

1. Z test: A z test is used to compare a sample mean to a known population mean when the population standard deviation is known. It helps determine if there is a significant difference between the sample mean and the population mean.

Example research question: Is there a significant difference between the average age of males and females in a given population?

2. T test for independent samples: A t test for independent samples compares the means of two independent groups to determine if they are significantly different from each other. It is typically used when comparing two groups that are completely separate and unrelated.

Example research question: Does a new teaching method result in significantly higher test scores compared to the traditional teaching method?

3. T test for dependent samples: A t test for dependent samples, also known as a paired t test or a matched pairs t test, compares the means of two related or paired groups. It is typically used when the same group of subjects is measured before and after an intervention or treatment.

Example research question: Does a new drug treatment significantly reduce the symptoms of anxiety in patients?

Remember, these examples are just to help you understand the different statistical tests. In practice, the research question and the appropriate statistical test will depend on the specific context and data you are working with.