presentation of quantitative data Flashcards
Why is summarising data used?
To demonstrate raw score, and usually contain a summary paragraph beneath the table explaining the results.
What is a bar chart?
Type of graph where the frequency of a variable is represented by the height of the bars in the graph.
What is a histogram?
Shows the frequency like a bar chart but the space in-between the bars show frequency also. The x-axis always start at zero as it increases.
What are scattergrams?
Represent strength and direction between co variables.
What is a normal distribution?
Bell-shaped curve in a graph. Most people are represented in the middle of the curve, with a few people at the extreme ends. The mean, median and mode all occupy the middle point of the curve.
What are skewed distributions?
Lean to the left or the right.
What is a positive skew?
Leans to the left, with a long tail on the right. The mode is the highest peak, with the median and the mean near the tail.
What is a negative skew?
Leans to the right, with the tail pointed at the left end of the graph. The mean is pulled to the left with the median in the middle and the mode at the peak.
