University of Phoenix Material
Week 1 Practice Worksheet
Prepare a written response to the following questions. Type your answers into the shaded boxes below. The boxes will expand as you type. Each correct answer is worth one point unless otherwise noted. Week 1 Practice Worksheet is worth 30 points.
1. Explain and give an example for each of the following types of variables.
a. Nominal: numbers assigned to represent something or someone, ex. person race, sex or nationality
b. Ordinal: conveys only that one value is greater or less than another, or order and rank ex.one school ranks no1 in the nation while another ranks no.3
c. Interval: scale that has no true zero, ex temperature
d. Ratio scale: most informative scale of measurement, offers true zero, and are distributed into equal units,ex.behaviors, weight
e. Continuous: measured along a continuum anywhere beyond the decimal point ex.scores on an exam
f. Discrete: measured in whole units that are not on a continuum ex.number of dreams recalled, or ranking of favorite foods
g. Quantitative: varies by amount, measured numerically and is often collected by measuring or counting ex.number of errors, rating of satisfaction
h. Qualitative: varies by class,this variable is often represented as a label and describes non numeric aspects of phenomena, ex. sex or body type
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 grouped frequency table and a histogram, then describe the general shape of the distribution.
For the grouped frequency table, fill in the data in the appropriate boxes below. The interval has been filled in for you. The “f” represents the frequency and “%” represents the relative...