Answers
Applied Data Analysis - assignment 3 & 4
- Course
- Institution
- Book
Master S&O Leiden University Applied Data Analysis - assignment 3 & 4
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Exam Guide for Applied Multivariate Data Analysis – Get yourself a Wonderful Grade!
-
Summary of Statistics (IBC), Radboud University
-
Answers assignment 3 business research methods
5 reviews
By: tobiasgiger • 2 year ago
By: marijneweerts • 2 year ago
By: ileentjuh • 4 year ago
By: fionarubingh • 4 year ago
By: vasoatma • 5 year ago
Seller
Followdjangojoosten
Reviews received
Content preview
ASSIGNMENTS 3 AND 4WHICH THERAPY
WORKS BEST?
23.10.2018
, 1. Pretest - t-tests
A) Assumptions
Normality. All three different groups exist out of sixty or more participants, so the
samples are all larger than n = 20. Also, the sizes of the groups do not vary much because
nmax : nmin < 1.5, which makes the t-test robust against violation of this assumption.
Homogeneity of variance. To check the assumption of homogeneity of variance of the
t-tests, Levene’s tests were conducted. The first test between the two education groups on the
pretest showed equal variances, F(1, 181) = 1.24, p = > .05. The second test comparing the
three therapy groups on pretest also showed equal variances, F(2, 181) = .58, p = > .05. The
Levene’s tests were non-significant which means that homogeneity of variance can be
assumed.
Independence. This assumption is a matter of design whether the observations are
completely independent from each other. There is no reason to assume that this is not the case
so there is no reason to reject the assumption of independence.
B) T-tests
Four independent-samples t-tests were performed to compare the two education groups on the
pretest and to compare the three “Therapy” groups on the pretest.
First, there was found a significant difference on the pretest, t(181) = -2.09, p < .05 in
the scores for a low education level (M = 60.23, SD = 1.55) and a high education level (M =
65,07, SD = 1.72). This means that on average participants from the high education group
reported being more satisfied with their lives before the therapy than participants from the
low education group. The difference represents a small effect, r = .15.
Second, the independent-samples t-test examining the cognitive therapy group (M =
62.48, SD = 14.91) versus the behavioral therapy group (M = 65.10, SD = 16.95) on the
pretest gave a non-significant difference, t(119) = -.90, p > .05. The differences in means tell
us that participants of the cognitive therapy group reported being less satisfied with their lives
than the participants from the behavioral therapy group before either of the therapies had
started, but this difference was not significant. The difference represents a small effect, r
= .08.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller djangojoosten. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.96. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now