University of Phoenix Material
Week 1 Practice Worksheet
Prepare a written response to the following questions.
1. Explain and give an example for each of the following types of variables:
a. Nominal: A nominal scale is a number that represents something or someone. They are often coded data such as zip codes.
b. Ordinal: An ordinal scale conveys that some value is less than/greater than another value. An example of this would be a ranking, like which school is ranked higher than another.
c. Interval: Interval scales are based on measurements that have no true zero and can be distributed in equal units. An example of this would be rating scales.
d. Ratio scale: Ratio scales are measurements that do have a true zero and they can also be distributed in equal units.
e. Continuous: A continuous variable is measured on a continuum. It can be measured at any point beyond the decimal. They can be measured in fractional units. An example of this is how Olympic runners are timed, to the nearest hundredths place.
f. Discrete: Discrete variables are measured in whole units and are not measured along a continuum. An example of this is when you count how many of something you have eaten.
g. Quantitative: The quantitative variable varies by the amount of something. It is measured numerically. An example of this would be the working, middle, and upper classes.
h. Qualitative: The qualitative variable varies by the class of something. It describes non-numeric aspects. An example of this is the seasons.
2. Following are the 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, 34, 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 frequency table and a histogram, then describe the general shape of the distribution.
The histogram (made it in excel) and...