tut 1 Flashcards
(13 cards)
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What is the purpose of the Explore function in SPSS?
It computes histograms and numerical summaries such as mean, median, SD, quartiles, etc., for a quantitative variable.
What steps do you take to access the Explore function in SPSS?
Analyze > Descriptive Statistics > Explore
What statistics does Explore provide?
N, N*, mean, median, SD, SE, Min, Max, Q1, Q3, IQR, range
How do you ensure quartiles are included in Explore output?
Click ‘Statistics’ and ensure ‘Descriptives’ and ‘Percentiles’ are checked.
What is the formula for standard error (SE)?
SE = standard deviation / √N
What is the interquartile range (IQR)?
IQR = Q3 - Q1
What is a boxplot?
A graphical summary of data using Q1, median, Q3, and min/max values, with whiskers and a box.
How to create a simple boxplot in SPSS for one variable?
Use Explore, and check the boxplot radio button in the dialog box.
How to draw side-by-side boxplots in SPSS?
Use Graphs > Boxplot > Simple > Define, and assign a grouping variable.
What are the variable types for Group, Gender, and Race in SPSS?
Group: nominal (0=control, 1=treatment); Gender: nominal (0=female, 1=male); Race: nominal (0=white, 1=non-white)
What type of variables are DMF and Toothbrush in SPSS?
Scale variables
How to summarize gender and race information in SPSS?
Use frequency tables or bar charts; variables are nominal so use counts/percentages.
