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All right sy math shmoop ing people interpreting categorical and

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quantitative data statistical measures That was the original title of

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harry potter Actually a lot of people don't know that

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okay the question when he has a quiz in math

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class every day for the past ten days she has

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kept track of her quiz grade and the amount of

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time she studied the day before the data she collected

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is shown in a scatter plot below Right here this

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thing Use the information answer the next to question So

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here we go Each minute of studying increased wendy's quiz

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grade by approximately how many points Well wendy seems to

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be ah studying pro here really If a minute of

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studying increases their grade by ex points while then we

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could say that studying increases her grade at a rate

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of x points per minute Not coincidentally that second phrasing

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sounds an awful lot like a description of slope The

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rate of vertical change points per unit of horizontal change

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one minute Imagine drawing a line through the data and

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estimating and well the slope of that line Let's do

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that so we can't calculate the exact slope of the

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line to best fit Yet here to estimate it our

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best bet is to use wendy's lowest and highest scores

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We got ten minutes of studying earned wendy thirty points

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and sixty minutes of studying earned her a hundred points

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well increasing her study time by sixty minus ten or

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fifty minutes increased her score by one hundred minus thirty

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is seventy points right So slope is the vertical change

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over the horizontal change or seventy points is to fifty

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minutes or seven Fists are one point four points per

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minute So each minute of studying increased wendy's grade by

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about one point Four points Yeah The answer is b

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and ah mei You do the same on shmoop please 00:01:46.087 --> [endTime] And then you know tell us about it

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