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Lesson 1: Data

A line graph is way to visually represent data, especially data that changes over time.  Let's take a look at an example. Created by Sal Khan.

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• What if the line went up and down but ended in the same place ?
• Then the trend wouldn't increase/decrease?
• So why do you look for the overall trend? Couldn't you look for the average?
• No, because the average does not help in finding trends.
• Why are more lines sometimes used if the number is increasing or decreasing?
• Would it be wrong if you explained some of it. Like if this question came up in an exam and you explained how sometimes it went up and sometimes it went down and then said that overall it went up. Would you loose any marks for the whole explanation and if you only explained it without the overall part then would it be correct?
• Uhh... No? Because if mostly the trend goes up than down then we can say that it is going up?
• this is a nice web site cool
• i'm having trouble with reading bar charts 3 what is midrange median range mode and mean
• I'm not sure what the midrange is BUT, the median is when you put the set of data into numerical order (10,15,18,19,20,20,26,27,30) then starting with the smallest cross out the number going back and forth between the biggest and smallest and cross them out untill you get to the middle. the middle number is your median, the median for this set of data is 20. the range is the maximum number (30) minus the minimum number(10) the range is 20 in this set of data. the mode for this set of data is the number that occurs most often therefor the mode is 20 ( i didn't know that the answers were mostly the same i just randomly came up with this set of data!) the mean is mean and hard, take all the numbers in the set of data and with a couculator add them all together then divide that num ber by the number of numbers in the set of data (9)he answer should be 20.555....

hope i helped!!:)
• Can a line graph possibly be more helpful than bar graph?
• Well... it depends on what you're comparing. Line graphs are useful for displaying smaller changes in a trend over time. Bar graphs are better for comparing larger changes or differences in data among groups.