# TSI Math: Finding the Approximate Slope of a Scatterplot

Each minute of studying increased Wendy's quiz grade by approximately how many points?

Data Analysis, Statistics, and Probability | Interpreting Categorical and Quantitative Data |

Mathematics and Statistics Assessment | Interpreting Categorical and Quantitive Data |

Product Type | TSI |

TSI | Mathematics and Statistics Assessment TSI Math TSI Mathematics |

TSI Math | Data Analysis, Statistics, and Probability |

TSI Mathematics | Data Analysis, Statistics, and Probability |

Test Prep | TSI |

### Transcript

kept track of her quiz grade and the amount of

time she studied the day before the data she collected

is shown in a scatter plot below Right here this

thing Use the information answer the next to question So

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

grade by approximately how many points Well wendy seems to

be ah studying pro here really If a minute of

studying increases their grade by ex points while then we

could say that studying increases her grade at a rate

of x points per minute Not coincidentally that second phrasing

sounds an awful lot like a description of slope The

rate of vertical change points per unit of horizontal change

one minute Imagine drawing a line through the data and

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

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

line to best fit Yet here to estimate it our

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

We got ten minutes of studying earned wendy thirty points

and sixty minutes of studying earned her a hundred points

well increasing her study time by sixty minus ten or

fifty minutes increased her score by one hundred minus thirty

is seventy points right So slope is the vertical change

over the horizontal change or seventy points is to fifty

minutes or seven Fists are one point four points per

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

about one point Four points Yeah The answer is b

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