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Chapter 1: Q4. (page 49)
List and define the five elements of an inferential statistical analysis.
The five elements of an inferential statistical analysis are the population size, number of variables, sample set, satistical inference about the population, and the measure of reliability.
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Who is better at multi-tasking? In business, employees are often asked to perform a complex task when their attention is divided (i.e., multi-tasking). Human Factors (May 2014) published a study designed to determine whether video game players are better than non–video game players at multi-tasking. Each in a sample of 60 college students was classified as a video game player or a nonplayer. Participants entered a street crossing simulator and were asked to cross a busy street at an unsigned intersection. The simulator was designed to have cars traveling at various high rates of speed in both directions. During the crossing, the students also performed a memory task as a distraction. Two variables were measured for each student: (1) a street crossing performance score (measured out of 100 points) and (2) a memory task score (measured out of 20 points). The researchers found no differences in either the street crossing performance or memory task score of video game players and non-gamers. “These results,” say the researchers, “suggest that action video game players [and non-gamers] are equally susceptible to the costs of dividing attention in a complex task”.
a. Identify the experimental unit for this study.
b. Identify the variables measured as quantitative or qualitative.
c. Is this an application of descriptive statistics or inferential statistics? Explain.
Explain how population and variables differ?
Customer orders at a department store. A department store receives customer orders through its call center and website. These orders, as well as any special orders received in the stores are forwarded to a distribution center where workers pull the items on the orders from inventory, pack them, and prepare the necessary paperwork for the shipping company that will pick up the packages and deliver them to the customers. In order to monitor the subprocess of pulling the items from inventory, one order is checked every 15 minutes to determine whether the worker has pulled the correct item.
a. Identify the process of interest.
b. Identify the variable of interest. Is it quantitative or qualitative?
c. Describe the sample.
d. Describe the inference of interest.
e. How likely is the sample to be representative?
Explain how populations and samples differ?
List the three major methods of collecting data and explain their differences.
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