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CAP4104 : Human & Technology Interaction. Chapter 8: Simple Quantitative Analysis. CAP4104 : Human & Technology Interaction. How do you feel about e-readers?.
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CAP4104 : Human & Technology Interaction Chapter 8: Simple Quantitative Analysis
CAP4104 : Human & Technology Interaction How do you feel about e-readers? Responses to this will be varied and may include that they are cool, lightweight, easy to carry, too expensive, difficult to use, too complex, etc. If you have 8 to 10 responses this may not be bad but if you have many more then It becomes harder to process the information. Let us suppose that instead of asking: How do you feel about e-readers? You ask: Are e-readers easy to handle or cumbersome? This clearly reduces the number of answers to: Easy to handle, cumbersome, and neither The initial analysis of this data might look like this:
CAP4104 : Human & Technology Interaction How do you feel about e-readers? Respondent Easy to handle Cumbersome Neither A 1 B 1 C 1 … Z 1 Total 14 5 7 Initial data analysis for the question “How do you feel about e-readers?” 14 out of 26 (54%) think it is easy to handle. 5 out of 26 (19%) think they are cumbersome. 7 out of 26 (27%) think they are neither easy to handle nor cumbersome.
CAP4104 : Human & Technology Interaction Another alternative which might be used in the questionnaire is to phrase the question in terms of Likert scale, such as the one below: In your opinion, are e-readers easy to handle: Strongly agree agree neither disagree strongly disagree In this case we are changing the data we are collecting and we can not say anything about whether respondents think e-readers are cumbersome. We can also say, for example 4 out of 26 (15%) disagree with the statement that E-readers are easy to handle ( and of those, 3 (11.5%) strongly disagree).
CAP4104 : Human & Technology Interaction How do you feel about e-readers? Respondent Strongly agree Agree Neither Disagree Strongly disagree A 1 B 1 C 1 … Z 1 Total 5 7 10 1 3 4 out of 26 (15%) disagree with the statement that e-readers are easy to handle and of those, 3 (11.5%) strongly disagree.
CAP4104 : Human & Technology Interaction Initial analysis might involve finding out averages and identifying any outliers. (i.e. values that are significantly different from the others) Producing graphical representation of data helps to get an overall view of data and any other patterns it contains. The next examples shows data that was collected to show: The experience of users and the number of errors made while trying to complete a control task
CAP4104 : Human & Technology Interaction Internet use More than Two or three Once a Number of errors User once a day Once a day Once a week times a week month made 1 1 4 2 1 2 3 1 1 4 1 0 5 1 2 6 1 3 7 1 2 8 1 0 9 1 3 10 1 2 11 1 1 12 1 2 13 1 4 14 1 2 15 1 1 16 1 1 17 1 0 18 1 0 Total 4 7 2 3 2 30 Mean (1.67)
CAP4104 : Human & Technology Interaction If we add one more user to Table 1 with an error rate of 9 we can see how using a scatter diagram helps to identify outliers in your data quite quickly.
CAP4104 : Human & Technology Interaction The data in the table below represents the time taken for a group of users to select and buy an item from an online shopping website. User A B C D E F G H I J K L M N O P Q R S Time to Complete 15 10 12 10 14 13 11 18 14 17 20 15 18 24 12 16 18 20 26 (mins) Using a spreadsheet application we will generate a bar graph and a scatter graph. From this representation we will make two initial observations about the data that might form the basis for further investigation.
