Tables - raw scores displayed in columns or rows with a summary paragraph underneath that explains the data.
Bar chart - categories place on x axis and frequency on the y axis; the height of each column represents the frequency of that item.
Histogram - bars touch each other, data is continuous and there is a true zero.
Line graph - frequency on one axis, data on the other is continuous; the line often shows how something changes.
Positive skew - distribution concentrated towards the left. Mode is the highest point with mean at the lowest (furthest left). Often occurs when most people score highly.
Negative skew - distribution concentrated towards the right. Mode is the highest, mean is skewed to the right. Often occurs when majority score low.
Normal distribution - a symmetrical, bell-shaped curve. Most people are in the middle area of the curve with few at the extreme ends. The mean, median, and mode all occupy the same mid-point of the curve.
Skewed distributions - distributions that lean to one side because most people are either at the lower or upper end of the distribution.
