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Graphs
Graphs often collect a set of data in a group of people. There are many kinds of graphs: pie charts (circle charts), bar graphs, line graphs, data tables, pictographs, flow charts, histograms, etc.
2,316 Questions
Why it is more useful to draw a graph then a table?
Though a table contains the data, it needs to be studied carefully. A graph, on the other hand, is an easier way to graphically show the same data, but in a more visually way.
Where is the dependent variable placed on a graph?
Generally the dependant variable is placed vertically on the y-axis. This is simply because you are usually trying to derive some equation of the form y = c*x + d.
What kind of graph represents data as slices of a pie?
It is a graph in the form of a circle representing 360 degrees around it.
What is used to compare two numbers on a graph?
Their position relative to a reference point - often the origin.
Interpretation of scatter graph?
It is a visual representation of changes in the values of two variables. The graph does not show causation.
Look at the pie graph pictured. What percentage of students brought their lunch to school?
The percentage would be: (degrees known/360) times 100
A graph does not cook your meals when you are hungry! A graph does not show causation.
When we plot all the points that satisfy an equation or inequality we do what to it?
Graph it (the equation).
In a line graph the independent variable is plotted on what axis?
It is plotted on the horizontal axis.
Difference between histogram and bar chart?
A histogram is one kind of bar chart.
Bar charts
If we want to represent the data collected about qualitative variable then a bar chart is the simplest method to employ.
The gaps between the categories in a bar chart are important: they emphasise the fact the categories used are mutually exclusive and do not form a continuum.
Histograms
Like bar charts, a histogram is produced by sorting data into categories (called bins). However, unlike a bar chart, the values on the x-axis form a continuum: the point at which one bin ends is the point at which the next bin begins. For this reason, neighbouring bars in a histogram must touch. In a bar chart, frequency is expressed as the height of the bar; whereas in a histogram it is expressed as the area of the bar.
Unlike a bar chart, where the gaps between the bars stress the absence of a continuum on the x-axis, the gaps in a histogram have a different meaning. Because the x-axis is a continuum, a gap in the data indicates that there were no data values in this bin.
The shape of the histogram depends on the choice of x₀ and the bin-width, and making the wrong choice can led to flawed interpretations. Too many bins and you cannot see the structure of the data properly due to the presence of too much information; too few bins and you cannot see the structure at all. There are various methods for choosing the ideal bin-width, but none is definitive.
Also, Both are used differently.
How do you find the center of a histogram?
It is the vertical line which divides the area of the graph into halves.
Why are graphs helpful for explaining data?
Graphs show data in a clear and concise form without interference from other factors.
Why is a bar graph or pictograph is more suitable to use than another type of graph?
Because a bar graph and pictographs are more visual and labelled than any other type of graph.
Does a line graph show changes in the responding variable only?
No. It shows changes in the response variable against changes in the explanatory (or independent) variable(s).
Could you use a line graph to show data?
yes and no becuase it depends how you want to use it bar graph is better though
Not necessarily. It could be that the domain and range of the variables is not sufficiently large. For example, if you plotted the ages and heights of boys in a school class you would probably find no identifiable trend. But that is not because there is no relationship between age and height, but simply the fact that the age range is very limited.
With time series data there is also a risk of aliasing. To take rather a contrived example, suppose you have a pendulum with a period of t seconds and you make observations about its location every 3t seconds. You will find that the location remains the same! That does not mean that there is no relationship between time and the position of a pendulum.
What is the difference between a dot plot and a histogram?
A dot plot displays individual data points as dots along a number line, allowing for clear visualization of small data sets and their frequencies. In contrast, a histogram groups data into bins or intervals and represents the frequency of data points within each bin using bars, which is useful for larger data sets and for illustrating data distribution. While both visualize frequency, dot plots emphasize individual values, whereas histograms focus on overall patterns and distributions.
What data is best displayed on a circle graph?
A circle graph, or pie chart is best used for showing parts of a whole.
How do you graph y-3x 5 and y2x-5?
Select a set of values for x from its domain. Calculate the corresponding values of y using one of the given equations. Plot the points on the coordinate plane and join the points. Repeat for the second equation, to give a second line.
How is a scatterplot graph different from a line graph?
I think that the difference is that a scatter plot graph has dots on it and that a line graph doesn't. Am sorry if I didn't answer your question properly but this is what I can offer. If it was not enough am sorry.
