Explain and give and example for each of the following types of variables

a. equal-interval
b. rank-order
c. nominal
d. ratio scale
e. continuous

Following are speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon;

30, 36,42,36,30,52,36,33,30,32,35,32,37,34,36,31,35,20,24,46,23,31,32,

45,34,37,28,40,34,38,40,52,31,33,15,27,36,40.

Make (a) a frequency table, (b) a histogram, and (c) a frequency polygon. Then describe the general shape of the distribution.

3. Give an example of something having these distribution shapes;

(a) bimodal
(b) approximately rectangular
(c) positively skewed

4. Find an example in a newspaper or magazine of a graph that misleads by failing to use equal interval sizes or by exaggerating proportions.