data analysis Flashcards
what is the difference between quantitative and qualitative data?
quantitative - numerical data that expresses the quantity of a measure
qualitative - expressed in words, are detailed and descriptive data
one advantage and one disadvantage of quantitative data
+ numerical so it can be analysed with statistics and easily compared with other quantitative data to detect patterns
- it isn’t detailed and cannot explain why the data collected is the way it is
one advantage and one disadvantage of qualitative data
+ it is detailed and descriptive so gives an in-depth picture of behaviour
- it is difficult to analyse, compare, test for significance or detect patterns and trends.
what is the difference between primary and secondary data?
primary data - data which is collected for the purpose of the current study
secondary data - data which was collected for another purpose/different study and then used in the study
three measures of central tendency
mean median and mode
what are the mean, mode and median
mean - the average calculated by adding all data points up and dividing by the number that there are
mode - most frequent score in a data set
median - is the middle value in a ranked (from lowest to highest) data set
advantage and disadvantage of using the mean
+ it is representative of all data scores as they are all included in the calculation
- it is possible that it can be skewed by an anomoly (very high/low score) and so may not be a true reflection of data
advantage and disadvantage of using the mode
+ it isnt affected by extreme values
- it is unrepresentative of all data points as it focuses on only the most frequent value and ignores the others
advantage and disadvantage of using the median
+ it isnt affected by extreme values
- it is unrepresentative of all data points as it focuses on only the middle value in the data set
what type of graph would be usually used with an experiment and for a correlation?
experiment: bar chart
correlation: scattergraph
