research methods- presentation of quantitive data Flashcards
what are the characteristics of tables?
-raw scores displayed in columns and rows
-summary paragraph beneath the table explains the findings and draws conclusions
what are the characteristics of bar charts?
-categories (discrete data) usually placed along the x-axis and frequency along y-axis (can be reversed)
-height of each column represents the frequency of that item
what are the characteristics of histograms?
-bars touch each other (in bar chart they don’t)
-data is continuous rather than discrete. there’s a true zero
what are the characteristics of scattergrams?
-used for correlational analysis
-each dot represents one pair of related data
-illustrates the strength and direction of correlation
-data on both axes must be continuous
in a normal distribution curve where do the mean, mode and median occupy?
all occupy the same mid-point of the curve
what is a skewed distribution?
distributions that lean to one side or the other because most items are either at the lower or upper end of the distribution
what type of skew is this?
negative
what type of skew is this?
positive
what is a negative skew distribution?
most of the distribution is concentrated towards the right of the graph, resulting in a LONG TAIL ON THE LEFT
where do the mean, mode and median occupy on a negative skew distribution?
mode highest point
median comes next
mean is dragged across to the left (if scores from lowest to highest)
what is a positive skew distribution?
most of the distribution is concentrated towards the left of the graph, resulting in a LONG TAIL ON THE RIGHT
where do the mean, mode and median occupy on a positive skew distribution?
mode is highest point
median next
mean dragged across to the right (if scores from lowest to highest)
