The outcomes of three different treatments for anxiety

Assignment Help Applied Statistics
Reference no: EM13716432

Study investigates whether there are differences in the outcomes of three different treatments for anxiety. The treatment conditions that are compared are treatment with medication, treatment with psychotherapy, and placebo (inactive pills). In addition, we want to see if gender of the client moderates the effects of the treatment. Every participant had been diagnosed with similar types and severity of anxiety disorders when they entered the study. Each participant was randomly assigned only to one of the three treatment conditions. After 12-weeks of treatment (or placebo), all participants completed two questionnaires to measure worry and general emotion. The higher the scores on these measures, the higher the anxiety level of the participant.

Directions:

The factorial MANOVA will combine what you have learned previously about

1.Post hoc tests when you have more than two groups on an IV (one-way ANOVA),

2.Main effects and interactions (factorial ANOVA), and

3.Working with multivariate analyses of multiple DVs (one-way MANOVA).

 

Using the SPSS data file for Module 6 (located in Topic Materials), answer the following questions:

1.What are the independent variables in this study? What are the dependent variables?

2.Why is a factorial MANOVA appropriate to use for this research design?

3.Did you find any errors that the researcher made when setting up the SPSS data file (don't forget to check the variable view)? If so, what did you find? How did you correct it?

HINT:

Yes, there are coding errors for Measures.

4.Perform Initial Data Screening. What did you find regarding missing values, univariate outliers, multivariate outliers, normality?

HINT:

Revisit instructions from last module's readings on how to compute Mahalanobis distance and then analyze for multivariate outliers.

5.Perform a factorial MANOVA on the data. Before interpreting the multivariate results of the MANOVA, check outcomes that test other assumptions for this statistic: equality of covariance matrices (see Box's Test) and sufficient correlation among the DVs (see Bartlett's Test of Sphericity). Also check the results of the Levene's Test of Equality of Error Variances to evaluate that assumption for the univariate ANOVAs that are run and show in the Tests of Between-Subjects Effects output. What have you found about whether the data meet these additional assumptions for the MANOVA and follow-up ANOVAs? Explain.

HINTS:

  • Once in the Options box, remember to check box for "Residual SSCP matrix" to get results for the Bartlett's test.
  • Also, remember to ask for post hoc tests for Treatment because there are more than two conditions. Profile plots also help with visualizing interactions.

 

6.What are the outcomes of the multivariate tests (main effects and interaction)? Report either the Pillai's Trace or Wilks's Lambda for each result, as well as the associated F-value and its statistical significance. Use the following format for notation to report each result: Pillai's Trace OR Wilks' lambda = ____; F(df, df) = ____, p = ____.

HINTS:

  • Use Pillai's trace if there are problems with heterogeneity of variance-covariance matrices for the DVs. Otherwise, Wilks' lambda is fine.
  • Eta squared cannot be calculated from the information provided in the multivariate tests results.

7.Given the results of the multivariate tests, would you now move on to interpret the results of the Tests of Between-Subjects Tests? If yes, what are the results and what do they mean? (Report each of the results using the format of F(df, df) = _____, p = _____ , ?2 = _____.)

8.Because one IV has more than two conditions, you would need to do post hoc tests if the overall F-value was statistically significant. If so, what results did you find?

9.If you had a significant interaction effect, what follow-up tests do you need to perform to understand how gender moderates the effects of treatment? What are the results?

10.Citing the results of your statistical analyses, what is the conclusion you can draw (and support) regarding research question that was posed in this research (see problem statement)?

HINT: Use the sample results write-up in the textbook to see what you should report and how to say it. Just substitute the correct language and values for the analyses you have done for this problem.

Verified Expert

Reference no: EM13716432

Questions Cloud

What is the sign of the entropy change for the heat transfer : What is the sign of the entropy change for the heat transfer. You probably know that when two objects at different temperatures are brought into contact, heat always travels from the hotter object to the colder object; never the reverse.
Degraded state is detected with probability 0.9 : Degraded state is detected with probability 0.9 (failed state with probability 1) and repair occurs in both degraded and failed states. Repair starts immediately upon detection of the failed or degraded state and restores the system to the oper..
The producers of a new toothpaste claim : 2.  The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months.  The mean number of cavities at their next checkup is 1.5. In the ge..
The outcomes of three different treatments for anxiety : Study investigates whether there are differences in the outcomes of three different treatments for anxiety. The treatment conditions that are compared are treatment with medication, treatment with psychotherapy, and placebo (inactive pills). ..
What is the residual : What do the Fitted (predicted) values and Residuals represent? For example, there is one record in the data set with height = 54 and weight = 110. Please use these numbers to explain what is the fitted value and what is the residual.
Draw the structure of the alkene that is produced : The tosylate of (2S,3R)-4-methyl-3-phenylpentan-2-ol undergoes an E2 elimination on treatment with sodium ethoxide. Draw the structure of the alkene that is produced.
What is the mol of pd used in the reaction : What is the mol% of Pd used in this reaction. ex: 5% mol% catalyst means that the reaction uses 5% as much catalyst as limiting reactant
Experiencing problems at home and at school : Jeremy is an eight year old boy that is experiencing problems at home and at school. While at home, his mother often complains that he is very messy, disorganized, and is frequently interrupting others. At school, his teachers report that he i..

Reviews

Write a Review

Applied Statistics Questions & Answers

  Whats the temperature

Whats the temperature

  Briefly interpret the descriptive data analysis

List and explain the variables you would collect in this study. There must be a minimum of three variables and two must meet the assumptions for a correlational analysis.

  Calculate the variance-covariance matrix

Calculate the variance-covariance matrix of the OLS estimator of β1.β2 and β3 and verify that:

  Question 1 let x yz denote iid random variables with exp

question 1 let x yz denote i.i.d. random variables with exp distribution for lambda gt 0. find px lt y zquestion 2

  Calculate the total tax bill

Calculate the total tax bill for both low and high income individuals in both countries and fill in the table above with your results and what is the unemployment rate

  State the process mean between the points x and y

Write a brief note stating the circumstances under which cusum charting may be preferable to normal Shewart charting methods and calculate the mean of the sample values below, and suggest a suitable value for k, the cusum reference value.

  Analyze the data using proc ttest

Write the null and alternative hypotheses and analyze the data using PROC TTEST, and turn in the printout.  From this, you will first have to test if the population variances are equal.

  Evaluate the project payback period and profitability index

Draw a time line to show the cash flows of project. Evaluate the projects payback period, profitability index net present value and internal rate of return

  The medical college admission test

The Medical College Admission Test

  Solve the simultaneous equations

A graphical method, solve the simultaneous equations - A graphical method, solve the quadratic equation

  Growth of bacterial colonies follows a poisson distribution

The growth of bacterial colonies follows a Poisson distribution.

  The learning of 6th graders on a math lesson

Consider Mary's study of whether the learning of 6th graders on a math lesson is affected by background noise level. Describe the pros and cons of Mary using a repeated measures design for this study. What would you probably choose to do? Suppo..

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd