University of Phoenix Material
Week One Practice Problems
Prepare a written response to the following questions.
Chapter 1
12. Explain and give an example for each of the following types of variables:
a. Equal interval: This refers to a quantative amount that has an equal split between values. For example, when referring to temperature, 85-90 degrees has the same equal interval as 50-55 degrees.
b. Rank-order: This refers to a ranking of items determined by participants or observers. For example, giving a questioner about five sodas and allowing each individual to rank them from their favorite to least favorite.
c. Nominal: This is a categorical word. In statistics, this is used to categorize items. This could be as simple as categorizing names alphabetically.
d. Ratio scale: The ratio scale is designed so that zero is an absolute variable. This would mean that in the absent of what may be examined, the scale would read zero without any additional variable. For example, a Fahrenheit thermometer cannot be considered a ratio scale because zero is not an absolute number. But money can be considered a ratio scale example. If you have change in your pocket, that if you’re variable. However, if you have no money then you have zero with no additional variables.
e. Continuous: This refers to data that can continuously be observed with an infinite value. This could also refer to money in the sense that it can constantly be counted with constant change in value.
f. Discrete: This refers to data that is discrete or to the point. A to the point example would be gender. Either the individual is male or female.
15. 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,...