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SPSS Worksheet 1: (ttest)
Instructions: Lesson 24 Exercise File 1 is located at the end of the chapter under the heading Exercises in your Green and Salkind textbook. Complete the exercise and then complete the worksheet below by filling in the blanks and answering the questions.
H_{0}1: There is no significant difference in the amount of time it takes to eat a Big Mac meal between overweigh and normal weight individuals.
Assumptions
Outliers: Create a Box and Whisker plot for each group. Hint: Graph > Legacy > Boxplot > Simple. Insert the Box and Whisker plot below: Note: Look for extreme outliers.
Fill in the blanks:
Groups 
Outliers (Item #) 
Are there any outliers?

Overweight 


Normal 


<Note: Remove any outliers from the dataset before continuing.>
Assumption of Normality: Run a normality test for each group. Hint: Begin by going to Analyze > Descriptive > Explore. See SPSS lesson 40, p. 327. Insert the Tests of Normality table below:
Fill in the blanks:
Should you use a ShapiroWilks or KolmogorovSmirnov test? Why?
Groups 
Significance 
Is the assumption of normality met? 
Overweight 


Normal 


Assumption of Equal Variance: Insert Levene’s Test of Equality of Error Variances^{a} table(s) below:
Fill in the blanks:
Significance 
Is the assumption of equal variance met? 


Results
Insert ttest for equality of Means table(s) below:
Fill in the blanks:
Equal variances assumed 
Value 
d.f. 

t– statistic 

t critical (Hint: See Appendix B in Warner) 

p– value 

Eta Squared (Hint: See formula) 

Is the tstatistic greater than tcritical?
Hint: Use the absolute value.
Is the pvalue less than .05?
Should you reject or fail to reject the null?
Is the effect size small, medium, or large? Hint: See Table 5.2 in Warner, p. 208.
Descriptive Statistics
Fill in the blanks:
Groups 
Mean 
S.D. 
Overweight 


Normal 


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