100% Original, Plagiarism Free, Tailored to your instructions

Order Now!

psychology statistics

psychology statistics

Week 4 Assignment

Increase text size
Decrease text size
Print Page
Application: Computing t Tests

The one-sample t test discussed in Chapter 6 requires that you know the population mean. It is unusual to have this information, so most studies compare two samples instead. Each sample measures a different condition of the independent variable.

Before conducting a study, it is important to know if you would need to conduct a matched-samples t test or an independent-samples t test. Independent samples consist of two groups of different people. One group has been randomly selected and is not specifically tied to who is in the other group. Matched samples are groups that are deliberately selected to be similar to each other (matched pairs) or they are the same people in both groups (repeated measures). For example, you might want to select two groups that have similar heights. If height could affect the experiment, it could be best to match the groups on that variable. This Assignment will allow you to convey your understanding of the basic concepts related to t testing and will allow you to practice setting up and conducting an inferential parametric test in SPSS.


Imagine you are a researcher who believes that a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. You randomly select a sample of 20 participants from a population of mild insomnia patients and randomly assign 10 to receive visualization therapy. The other 10 participants receive no treatment.

You then measure how long (in minutes) it takes participants to fall asleep. Your data are below. The numbers represent the number of minutes each participant took to fall asleep.
No Treatment (X1)

Treatment (X2)












To complete this Assignment, submit by Day 7 a response to each of the following:

Explain whether you chose to use an independent-samples t test or a matched-samples t test. Provide a rationale for your choice.
Identify the independent and dependent variables.
Knowing you believe the treatment will reduce the amount of time to fall asleep, state the null and alternate hypotheses in words (not formulas).
Explain whether you would use a one-tailed or two-tailed test and why.
Explain whether you have homogeneity of variance, and explain how you know. Explain why it is important to know if you have homogeneity of variance.
Identify the obtained t value for this data set using SPSS.
Identify the degrees of freedom and explain how you determined it.
Identify the p value.
Explain whether you should retain or reject the null hypothesis and why.
Explain what you can conclude about the effectiveness of visualization therapy.
Submit three documents for grading: your text (Word) document with your answers and explanations to the application questions, your SPSS Data file, and your SPSS Output file.
Provide an APA reference list.
Week 4 Learning Resources
Increase text size
Decrease text size
Print Page

This page contains the Learning Resources for this week. Be sure to scroll down the page to see all of this week’s assigned Learning Resources.
Required Resources
Heiman, G. (2015). Behavioral sciences STAT 2 (2nd ed). Stamford, CT: Cengage..
Chapter 8, “Hypothesis Testing Using the One-Sample t-test” (pp.126-138)
Chapter 9, “Hypothesis Testing Using the Two-Sample t-test” (pp.140-158)
Chapter 9 Review Card (p. 9.4)
StatsLectures. (2011a). SPSS – Dependent samples t-test [Video file]. Retrieved fromhttp://www.youtube.com/watch v=DzitbJHIBQM

Note: The approximate length of this media piece is 4 minutes.

This resource can help you determine a dependent-samples t test from sample data in SPSS.
StatsLectures. (2011c). SPSS – Independent samples t-test [Video file]. Retrieved fromhttp://www.youtube.com/watch v=VUUfBWlziIU

Note: The approximate length of this media piece is 5 minutes.

This resource can help you conduct an independent-sample t test from sample data in SPSS.

Our Service Charter

  1. Excellent Quality / 100% Plagiarism-Free

    We employ a number of measures to ensure top quality essays. The papers go through a system of quality control prior to delivery. We run plagiarism checks on each paper to ensure that they will be 100% plagiarism-free. So, only clean copies hit customers’ emails. We also never resell the papers completed by our writers. So, once it is checked using a plagiarism checker, the paper will be unique. Speaking of the academic writing standards, we will stick to the assignment brief given by the customer and assign the perfect writer. By saying “the perfect writer” we mean the one having an academic degree in the customer’s study field and positive feedback from other customers.
  2. Free Revisions

    We keep the quality bar of all papers high. But in case you need some extra brilliance to the paper, here’s what to do. First of all, you can choose a top writer. It means that we will assign an expert with a degree in your subject. And secondly, you can rely on our editing services. Our editors will revise your papers, checking whether or not they comply with high standards of academic writing. In addition, editing entails adjusting content if it’s off the topic, adding more sources, refining the language style, and making sure the referencing style is followed.
  3. Confidentiality / 100% No Disclosure

    We make sure that clients’ personal data remains confidential and is not exploited for any purposes beyond those related to our services. We only ask you to provide us with the information that is required to produce the paper according to your writing needs. Please note that the payment info is protected as well. Feel free to refer to the support team for more information about our payment methods. The fact that you used our service is kept secret due to the advanced security standards. So, you can be sure that no one will find out that you got a paper from our writing service.
  4. Money Back Guarantee

    If the writer doesn’t address all the questions on your assignment brief or the delivered paper appears to be off the topic, you can ask for a refund. Or, if it is applicable, you can opt in for free revision within 14-30 days, depending on your paper’s length. The revision or refund request should be sent within 14 days after delivery. The customer gets 100% money-back in case they haven't downloaded the paper. All approved refunds will be returned to the customer’s credit card or Bonus Balance in a form of store credit. Take a note that we will send an extra compensation if the customers goes with a store credit.
  5. 24/7 Customer Support

    We have a support team working 24/7 ready to give your issue concerning the order their immediate attention. If you have any questions about the ordering process, communication with the writer, payment options, feel free to join live chat. Be sure to get a fast response. They can also give you the exact price quote, taking into account the timing, desired academic level of the paper, and the number of pages.

Excellent Quality
Zero Plagiarism
Expert Writers

Instant Quote

Instant Quote
Single spaced
approx 275 words per page
Urgency (Less urgent, less costly):
Total Cost: NaN

Get 10% Off on your 1st order!