What is the one-tailed significance level

Assignment Help Basic Statistics

Reference no: EM131268715

A. Independent Samples t-test - Non-directional

For this exercise think of a research question, e.g. do mean scores on an anxiety measure differ by type of therapy group? You are asked to:

1. Formulate your own research question with corresponding null and alternate hypotheses.

2. Create your own data appropriate for your research question.

3. Test your hypotheses using the SPSS Independent Samples t-test procedure.

Begin constructing your data file by labeling your independent and dependent variables. Designate variable types. Provide value labels for your independent variables (do you know why?). Below is an example for the therapy group/anxiety score research question. DO NOT USE THE DATA BELOW, DOING SO WILL RESULT IN A 0 ON THIS ASSIGNMENT.

THGROUP ANXSCORE

1 30

2 40

1 50

2 60

1 25

2 30

Everyone should have different variables and data for this exercise, i.e., do not use the same numbers or variables associated with the example above, and don't use your friend's either. Create your own variables and data based on your research question.
Provide data for 20participants, 10 for each level of your IV (think 20 rows in SPSS).
At alpha = .05, the data that you create should yield a non-significant two-tailed p value (sig. on SPSS)associated with your t test. You may need to play around with the data to accomplish this.
Make sure the homogeneity of variance assumption is not violated. Look in the Field text for further clarification on Levine's test.

Run the t-test analysis and then complete the following:

1. Clearly state your research question. In words, what are your null and alternate hypotheses (you will write the statistical hypotheses later in the step process).

2. Clearly state your independent variable (IV) and dependent variable (DV).

3. Write out the steps for this statistical problem (four steps) as explained in class and in your slides. Refer to your SPSS output for Step #4 (e.g. see output) - do not calculate the t test by hand.

4. What is the two-tailed significance level (sig or p value)? What does it mean within the context of your question? Do you reject the null? Why or why not?

5. If your research question was directional and you needed to interpret the one-tailed significance level (p value), what isthe one-tailed pvalue/ sig level from your analysis?

6. Interpret the confidence intervals from your analysis. How do they provide you with information regarding whether to reject or retain the null?

7. Summarize your overall results clearly in paragraph form. Make sure to relate your results to your research question.

B. Paired/Dependent Samples t-test: Directional

For this exercise think of a research question, e.g. do mean scores on a spelling test improve after intensive study? You are asked to:

1. Formulate your own research question with corresponding null and alternate hypotheses.

2. Create your own data appropriate for your research question.

3. Test your hypotheses using the SPSS Paired/Dependent Samples t-test procedure.

Here is an example of how to set up the data. Look in your SPSS text for more examples. DO NOT USE THE DATA BELOW; DOING SO WILL RESULT IN A 0 ON THIS ASSIGNMENT.

BE_STUDY AF_STUDY

6 15

7 12

8 5

9 14

11 16

12 22

As noted previously, everyone should have different variables and data for this exercise.
Provide data for 20 participants (think 20 rows in SPSS).
At alpha = .05, the data that you create should yield a significant one-tailed p value ("sig" on SPSS) associated with your t test. Keep modifying the data to accomplish this.

Run the appropriate t-test analysis and complete the following:

1. Clearly state your research question. In words, what are your null and alternate hypotheses?

2. Clearly state your independent variable (IV) and dependent variable (DV).

4. What is the one-tailed significance level (p value)? What does it mean within the context of your question? Do you reject the null? Why or why not?

5. If your research question was non-directional and you needed to interpret the two-tailed significance level (p value), what is the two-tailed value from your analysis?

6. Interpret the confidence intervals from your analysis. How do they provide you with information regarding whether to reject or retain the null?

7. Summarize your overall results clearly in paragraph form. Make sure to relate your results to your research question.

Need the following:

1. The responses to the questions at the end of each section.

2. The outputs from both parts A and B.

Reference no: EM131268715

Questions Cloud

Subjected to different environments : Describe in details all the stages and procedure one can follow in programming a robot or any other system that automatically runs or performs a specific task once triggered by certain conditions or when subjected to different environments.

Define a value-returning function : Write a Python program that defines a value-returning function named cuber that returns both the surface area and volume of a cube. A cube is a rectangular prism with all sides equal.

What are the mission and values of the organization : Same as B, but select one group member to present their answer to the entire class. Conclusion The instructor may lead a class discussion and/or make concluding remarks. Apply It (2-4 minutes) What did I learn from this exercise? When will I imple..

New examples base on decision tree : Show information gain computations that you used to induce a complete decision tree and draw the tree. Give the class labels for the following new examples base on your decision tree.

What is the one-tailed significance level : What is the one-tailed significance level (p value)? What does it mean within the context of your question? Do you reject the null? Why or why not. Clearly state your independent variable (IV) and dependent variable (DV)

At what rate is the tip of the person s shadow moving away : A streetlight is on top of a 20-foot pole.- At what rate is the tip of the person s shadow moving away from the pole when he is 20 feet from the pole?

Difference between absolute-apparent : On a proportional symbol map, explain the difference between absolute, apparent, and range grading scaling.

Is avon''s culture a contributing factor to its success : The text points out that an organization's culture serves two important functions: (1) it creates internal unity, and (2) it helps the organization adapt to the external environment. Has this been the case at Avon?

At what rate is the person s shadow growing : A person who is 5 feet tall walks away from the pole at the rate of 5 feet per second. - At what rate is the tip of the person s shadow moving away from the pole when he is 20 feet from the pole?

User Account

All Pages