Btm8107 8 week2 activity understanding and exploring assumptions a+ work

1. BTM8107-8 Week: 2 Activity: Understanding and Exploring Assumptions A+
Work
Activity Description
You will submitone Word document,including your SPSS output.
1. Why do we care whether the assumptions required for statistical tests are met? (Tip:You mightalso wantto write
your answer on a note
card you paste to your computer.)
2. Open the data setthat you corrected in Activity #1 for DownloadFestival.sav.You will use the following variables:
Day1, Day2, and Day3 (hygiene variable for all three days). Create a simple histogram for each variable.Choose to
displaythe normal curve (under ElementProperties) and title your charts.Copy these plots into your Word document.
3. Now create probability-probability(p-p) plots for each variable. This output will give you additional information.
Read over the Case Processing Summary.Notice that there is missing data for Days 2 and Day 3. Copy only the
Normal p-p Plots into your Word document(you do not need to copy the beginning outputnor the Detrended Normal
p-p Plots).
4. Examining the histograms and p-p plots,describe the datasetwith particular attention toward the assumption of
normality.For each day, do you think the responses are reasonablynormallydistributed? (Justgive your impression
of the data.) Why or why not?
5. Using the same datasetand the Frequency command,calculate the standard descriptive measures (mean,
median,mode,standard deviation,variance and range) as well as kurtosis and skew for all three hygiene variables.
Paste your outputinto your Word document(you do not need to paste the Frequency Table). What does the output
tell you? You will need to commenton:sample size,measures ofcentral tendency and dispersion and well as
kurtosis and skewness.You will need to either calculate z scores for skewness andkurtosis or use those given in the
book to provide a complete answer.Bottom line:is the assumption ofnormalitymetfor these three variables? Does
this match your visual observations from question #1?
6. Using the datasetSPSSExam.sav and the Frequency command,calculate:the standard descriptive statistics
(mean,median,mode,standard deviation,variance and range) plus skew and kurtosis,and histograms with the
normal curve on the following variables:Computer,Exam,Lecture, and Numeracyfor the entire dataset.Complete
the same analysis using Universityas a grouping variable.Paste your output into your Word document(you do not
need to paste the Frequency Table). What do the results tell you with regard to whether the data is normally
distributed?
7. Using the datasetSPSSExam.sav, determine whether the scores on computer literacyand percentage of lectures
attended (with University as a grouping variable) meetthe assumption ofhomogeneityof variance (use Levene’s
test). You mustremember to unclick the “splitfile” option used above before conducting this test.What does the
output tell you? (Be as specific as possible.)
8. Describe the assumptions ofnormalityand homogeneityof variance. When these assumptions are violated,what
are your options? Are there cases in which the assumptions maytechnicallybe violated, yet have no impacton your
intended analyses? Explain.Your submittal should demonstrate thoughtful consideration ofthe ideas and concepts
that are presented in the course and provide new
thoughts and insights relating directlyto this topic. Where applicable your submittal should reflectscholarlywriting
and current APA standards.
Review APA Form and Style.
Be sure to adhere to Northcentral University's Academic Integrity Policy. View the Northcentral Academic Integrity
Tutorial to refresh your knowledge ofhow to achieve academic integrity.
Upload your assignmentusing the Upload Assignmentbutton below.
Learning Outcomes
3.0 Calculate and interpretdescriptive statistical analysis.
4.0 Create and interpretvisual displays ofdata.
8.0 Analyze and apply the assumptions required for valid inferential tests.

2. 10.0 Demonstrate proficiencyin the use of SPSS.
Resources
Books
Reference Instruction
Field, A. (2013) Discovering statistics using IBM SPSS Statistics.Read Chapter 5
Websites
Reference Instruction
Field text companion site.Provides access to SPSS data files.
http://www.sagepub.com/field4e/main.htm
Complete Chapter Exercises
http://www.coursemerit.com/solution-details/7685/BTM8107-8--Week-2--Activity-Understanding-and-
Exploring-Assumptions--A-Work