Data recording, analysis and presentation: Practice Questions

Which level of data involves categorizing information into named groups that have no numerical value and no inherent order?

A researcher collects the following set of data representing scores on a stress questionnaire: 14, 18, 12, 22, 14, 25, 14. Which measure of central tendency would provide a value of 14 for this dataset?

In a negatively skewed distribution, which of the following statements correctly describes the relationship between the three main measures of central tendency?

A psychologist calculates the following test scores from a small sample: 4, 7, 7, 8, 9, 10, 11. What is the mean of this data set?

During the analysis of a dataset, a researcher notes that the mean is \( 75 \), the median is \( 60 \), and the mode is \( 55 \). Based on these measures of central tendency, what is the most likely shape of the distribution curve?

A researcher recorded the following number of aggressive acts in a classroom over five days: Day 1: 3, Day 2: 7, Day 3: 5, Day 4: 2, and Day 5: 8. If this data were to be displayed in a bar chart, what should be the label for the y-axis and which day would have the highest bar?

In the Results section of a psychological report, a student presents a scatter diagram showing the relationship between hours spent on social media and self-esteem scores. Describe two features that must be included in this diagram to ensure it accurately represents the relationship between the variables.

A psychologist is choosing between a Wilcoxon Signed Ranks test and a Mann-Whitney U test for their data analysis. Explain the three criteria (level of data, experimental design, and purpose of the test) that would lead the researcher to select the Wilcoxon Signed Ranks test.