*Presentation Of Quantitative Data Flashcards
(13 cards)
What is a normal distribution?
A symmetrical spread of frequency data that forms a bell-shaped pattern.
The mean, median, and mode are all located at the highest peak.
What characterizes a skewed distribution?
A spread of frequency data that isn’t symmetrical, where the data clusters to one end.
Can be either positively or negatively skewed.
What is a summary table?
A way of representing data that is not raw but converted into descriptive statistics.
It is standard practice to include a summary paragraph under the table explaining the numbers and drawing conclusions.
What is the most suitable graph for categorical data?
Bar chart.
Bar charts are used when data is divided into categories, known as discrete data.
What do bar charts display on the x-axis?
Categories of data.
In this context, the categories could be conditions like Speedupp and Water condition.
How does a histogram differ from a bar chart?
The bars touch each other, indicating continuous data on the x-axis.
Histograms represent equal-sized intervals of a single category.
What does the y-axis represent in a histogram?
The frequency within each interval.
If there is zero frequency for an interval, the interval remains but without a bar.
What is the purpose of a scattergram?
To depict associations between two co-variables.
Each point on the graph corresponds to the x and y position of the co-variables.
What type of data do line graphs represent?
Continuous data.
They use points connected by lines to show changes in value.
What is the shape of the curve in a normal distribution?
A bell-shaped curve.
Most people are located in the middle area of the curve with very few at the extremes.
What happens to the mean, median, and mode in a normal distribution?
They all occupy the same midpoint on the curve.
The ‘tails’ of the curve never touch the horizontal x-axis.
What is a positive skew?
When most of the distribution is concentrated towards the left of the graph, resulting in a long tail on the right.
The mode remains at the highest point, followed by the median, with the mean dragged towards the tail.
What is a negative skew?
When most of the distribution is concentrated towards the right of the graph, resulting in a long tail on the left.
The mode remains at the highest point, followed by the median, with the mean dragged towards the left tail.
