Problem #3 Modification and Recoding of Data
Part 1:
1. Data set is Group
2. Variables of interest are Year and Age
Directions:
Determine the average age of students, based on their class ranking of either Lower or Upper class standing. This requires the creation of a new variable. Examine the variable Year to create new variable based on current class standing. Be sure to give the new variable groupings a relative name. To compare the average age, run the “Means” test, Analyze>Compare Means>Means to obtain the statistics.
1. Recode class year ( variable is Year) into Lower Class and Upper Class.
a. Lower Class is Freshman and Sophomore
b. Upper Class is Junior and Senior
2. What is the average age of Lower class students?
3. What is the average age of Upper class students?
Part 2:
1. Data set is Census90
2. Variable of interest is Age
Directions:
1. Recode age into Young and Old
a. Young is any age less than 40
b. Old is any age 40 and above
Follow the procedures in Part One. In addition, run Descriptive statistics for Skewness, Kurtosis, Histogram with Normal Curve, and Normality test on the overall variable, Age.
2. a. How many Young people are there?
b. How many Old people are there?
3. a. What is the average age of Young people?
b. What is the average age of Old people?