Midterm 1 Review Sheet Directions: Page 9 provides data from a random sample of GSS 2002 respondents. A codebook is also provided, which corresponds to the data. Use the information contained in the data and the codebook to answer all of the exam questions. Page 9 also contains some useful formulas which will help you perform calculations. 1. How many variables are in the data set (excluding the ID variable)? 2. How many cases are in the data set? 3. What is the level of measurement of each variable (excluding the ID variable)? How do you know that this is the level of measurement? 14. Using the grids provided below, for each variable construct a table containing the following statistics: frequency distribution, percentage distribution, cumulative frequency distribution, cumulative percentage distribution. Make sure your tables contain all of the essential elements of a table. f c % c% f c % c% f c % c% 25. Using the grid space provided below, graph each of the variables using either a bar chart or a histogram (choose the one that you think is most correct). Graph the number of cases in each category. Make sure your graphs contain all of the essential elements of a graph. 36. Calculate all appropriate (meaning only those that can be meaningfully interpreted) measures of central tendency (mode, mean, median) for each variable. Be sure to show all of your work. 47. Choosing from among the measures you calculated, decide which measure of central tendency best describes this data. Explain why you choose this measure. 8. Interpret the substantive meaning of the measure of central tendency that you calculated for each variable. 59. Calculate all appropriate (meaning only those that can be meaningfully interpreted) measures of variability (IQV, range, IQR, Variance, Standard Deviation) for each variable. Be sure to show all of your work. 610. Using the gird below construct a box plot for any interval/ratio variables. You may plot multiple box plots on the same axis, if you would like. 11. Choosing from among the measures you calculated, decide which measure of central variability best describes this data. Explain why you choose this measure. 712. Interpret the substantive meaning of the measure of variability that you calculated for each variable. (3 points) 8Random Sample from GSS 2002 ID SEX CLASS EDUC 1 1 3 17 2 2 2 11 3 1 4 18 4 1 4 18 5 2 3 14 6 2 2 14 7 2 3 16 8 2 2 12 9 2 2 12 10 1 2 12 11 2 3 14 12 1 3 14 13 1 1 14 14 1 3 16 15 2 3 12 16 1 3 18 17 2 3 15 18 1 3 12 19 1 3 12 20 2 2 13 21 2 3 12 22 1 2 16 23 2 2 8 24 2 2 12 25 2 1 10 26 1 3 14 27 2 2 13 28 1 3 16 Useful Formulas: NYY∑= IQV =)1(100)100(222−−∑KPctK CodeBook ID: RESPONDENT’S IDENTIFICATION NUMBER SEX: RESPONDENT'S SEX Value Labels: 1 MALE 2 FEMALE CLASS: SUBJECTIVE CLASS IDENTIFACTION If you were asked to use one of four names for your social class, which would you say you belong in: the lower class, the working class, the middle class, or the upper class? Value Labels: 1 LOWER CLASS 2 WORKING CLASS 3 MIDDLE CLASS 4 UPPER CLASS EDUC: HIGHEST YEAR OF SCHOOL COMPLETED How many years did you complete? Value Labels: CODE ACTUAL VALUE More Useful Formulas: 1)(22−−=∑NYYSY 2YYSS =