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CADA Final Review Assessment –Continuous assessment (10%) –Mini-project (20%) –Mid-test (20%) –Final Examination (50%) 40% from Part 1 & 2 60% from Part 3 & 4
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Main contents Getting Started with SPSS Describing Data Testing Hypothesis Examining Relationships
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Part 1: Getting Started with SPSS Try to open the SPSS data file demo.sav. SPSS example files can be found C:\Program Files\SPSSInc\Statistics17\Samples\English This data file is a fictitious survey of several thousand people, containing basic demographic and consumer information. In Data View, columns represent variables, and rows represent cases (observations).
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Construct a SPSS data file In Variable View, each row is a variable, and each column is an attribute that is associated with that variable. 1. By entering data directly2. By reading from other applications
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Nominal (type of car owned) discrete (number of children) continuous (time of an exam) Scale (Quantitative) DATA ordinal Summary of Types of Variables Categorical Data
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A simple frequency table The “missing” item tells us how many people did not select one of the two valid answers.
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Pie charts
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Bar chart
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Histogram ( 直方图 ) It is a histogram for grouped numerical data in which the frequencies or percentages of each group of numerical data are represented as individual bars.
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Stem-and-leaf plots completion time in hours Stem-and-Leaf Plot for agecat6= 45-49 Frequency Stem & Leaf 2.00 2. 99 13.00 3. 0022223344444 40.00 3. 555566777777788888888899999999999999999 35.00 4. 00000001111111122222233333333334444 21.00 4. 555666666777778888899 12.00 5. 000111111234 9.00 5. 667778889 4.00 6. 0011 4.00 Extremes (>=6.2) Stem width: 1.00 Each leaf: 1 case(s)
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Basic statistics
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Test Relationship between Scale & Categorical Variables Compare Means
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Age, Education, and Internet Use Internet use by age (statistics for subgroups)
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ANOVA Table The F test shows that there is a significant difference among average hours worked per week in five categories of education.
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Multiple Comparison
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Testing a single mean The standard error of the mean is The t -statistic The 95% confidence interval of the difference is
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Testing a Hypothesis about Two related means
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This problem is recommended to use the paired-samples t test.
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Testing Two Independent Means
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Output from t test for TV watching hours
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Bar chart of completion time by Age and Gender
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Two-way ANOVA
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Relationship between Scale Variables
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Linear regression model
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The regression model becomes life expectancy=90-(0.70 x birthrate) That tells us that for an increase of 1 in birthrate, there is a decrease in life expectancy of 0.70 years.
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ANOVA
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Prediction and residuals
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Checking for normality
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Association between Categorical Variables
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Crosstabulation Contingency Table by the use of time and education Here the percentages are column %
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Gender Hand Preference LeftRight Female Observed = 12 Expected = 14.4 Observed = 108 Expected = 105.6 120 Male Observed = 24 Expected = 21.6 Observed = 156 Expected = 158.4 180 36264300 The Chi-Square Test Statistic The test statistic is:
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Chi-square Test on Independence Since the p-value=0.00012<0.05, you reject the null hypothesis of independence. There is strong evidence of a relationship between primary reason for not returning and the hotel.
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