Questions

Write your answers on this page, use the second page for graphs and charts.
1. The following data set shows the number of employed, 16 years or older, over the years 1948-1979. (Rounded to "millions").

a) Construct a stem and leaf plot for the data.
b) What is the mean? ________ What is the median? _______
(total pts: 15)

2.3, 1.9, 2.8, 3.9, 3.8, 2.8, 4.8, 7.3, 3.6, 1.8, 2.9, 4.7, 3.4, 2.8, 4.3, 6.9, 3.3, 3.5, 4.6, 3.9, 2.9,
4.1, 5.1, 6.0, 2.1, 2.9, 3.7, 4.1, 3.0, 5.0, 7.8, 6.0

2. The following data sets show the IQ and achievement test scores for 20 third graders. a). Compute means, medians, modes, variances, & standard deviations for both variables. SHOW ALL COMPUTATIONS, use the back of this page if necessary (total pts: 50)

Student     IQ              Achievement               IQ      ACHSCR

1                     128                                 200                                        _______ _______
2                     111                                 190
3                      94                                  176                                        _______ _______
4                     116                                 217
5                     103                                 146                                        _______ _______
6                     101                                 153
7                     108                                   92                                        _______ _______
8                     107                                 176
9                     103                                 209                                        _______ _______
10                   118                                 184
11                   101                                 146
12                   109                                 239
13                   116                                 120
14                    84                                   78
15                   100                                222
16                   102                                120
17                   115                                137
18                   84                                    75
19                   97                                    92
20                   92                                    75
3. Compute the z-scores for students 18, 7, 1, 9, 12 on both variables. SHOW ALL COMPUTATIONS - use the back of this page if necessary (total pts: 35)
18 = ______ 7 = ______ 1 = ______ 9 =______ 12 = ______ 4.
Extra credit: 15 pts possible (5 + 5 + 5) a) Draw frequency polygon data set 1. b)
Draw graphs (your choice) for the two variables in data set 2. c)
In words, describe the relationship between the two variables in data set 2 in general, and student 12 in particular. 1a)

STEM AND LEAF PLOT 4a)

EXTRA CREDIT (Use line for chart) _____________________________________________________

4b) EXTRA CREDIT (Use lines for charts)

Answers

These answers were calculated with Microsoft Excel. We would like to thank Anne Kirkpatrick for calculating these answers.

This page is maintained by
William Fuller