Intermediate Statistics Using SPSS by Herschel Knapp

Author:Herschel Knapp
Language: eng
Format: epub
Published: 2017-09-25T06:19:07.356794+00:00

Key Concepts

Paired t test

Paired t test designs (synonyms): Pretest/treatment/posttest

Pretest/posttest design

Simple time-series design

O-X-O design

Histogram with a normal curve

Paired t test with multiple metrics

Δ%

Wilcoxon test

Good common sense Internal validity

History

Testing

Maturation

Hawthorne effect

Practice Exercises

Exercise 8.1

Acme Industries has implemented a new website for employees to enter their weekly hours (e.g., start time, end time, sick hours, vacation hours, holiday hours, family leave hours). Upon clicking Save, the system checks the validity of the entries and points the user to correct any errors or omissions before saving the data. To evaluate the efficiency of this new website, the system journals the access time (in seconds) indicating how long it took for each employee to file their daily entries. A manager will assess the mean access times starting at the initial launch of the website (Week1), and continue to gather data for the next week (Week2).

Data set: Ch 08 – Exercise 01A.sav

Codebook Variable: ID

Definition: Employee ID

Type: Alphanumeric

Variable: Week1

Definition: Average time (in seconds) required to fill out webpage for first week

Type: Continuous

Variable: Week2

Definition: Average time (in seconds) required to fill out webpage for second week

Type: Continuous

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