We have changed our privacy policy. In addition, we use cookies on our website for various purposes. By continuing on our website, you consent to our use of cookies. You can learn about our practices by reading our privacy policy.

ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Algebra I Videos 81 videos

Simplifying Radicals
9742 Views

We don't like knocking people down to size, but we do like simplifying radicals. Join us?

ACT Math 2.2 Intermediate Algebra
471 Views

ACT Math Intermediate Algebra Drill 2, Problem 2. How else can the expression be written?

GED Math 1.3 Rational Numbers
367 Views

GED Math 1.3 Rational Numbers. Which answer best fills in the blank?

See All

CAHSEE Math 5.2 Statistics, Data, and Probability II 176 Views


Share It!


Description:

Statistics, Data, and Probability II Drill 5 Problem 2. Based on this data, a student who had missed 10 days of school can expect his GPA to be about what?

Language:
English Language

Transcript

00:03

Here’s your shmoop du jour...

00:05

Edgar, student at Duh University, has made a shocking, controversial claim –

00:10

that more time spent in school means better grades.

00:15

He may just be a student by day, but by night… Edgar is… CAPTAIN OBVIOUS!

00:21

Anyway, he conducted a survey asking students about the number of days that they were absent

00:25

in a semester, and their semester GPAs were. The results are shown in the plot below. 

00:30

Based on this, a student who had missed 10 days of school can expect his GPA to be about…what?

00:37

And here are the potential answers...

00:42

OK, so this question is testing whether we

00:44

know the difference between positive and negative correlations.

00:48

The basic idea is that if elements are positively correlated, they generally head in the same direction.

00:54

So... given NO OTHER DATA, if we just looked at this scatter plot of points, we’d surmise

01:00

that they generally drift south as we move to the right.

01:03

There is a clear ‘directionality’ to them. So we've got absences on one side and GPA on the other.

01:09

How much are they alike?

01:10

As we get higher in absences we have a LOWER grade point average – so in this case it’s

01:15

a pretty clear NEGATIVE correlation.

01:17

That is – more absences means lower grades.

01:21

If it had been more absences means HIGHER grades, we’d have the dots gradually sloping

01:26

UP instead of down… …and we’d have a whole lot fewer kids in school.

01:30

The answer is B.

01:32

As in… “Brains don’t work that way.”

Related Videos

CAHSEE Math 5.3 Algebra and Functions
2033 Views

CAHSEE Math: Algebra and Functions Drill 5, Problem 3. Solve the equation.

SAT Math 6.1 Geometry and Measurement
3974 Views

SAT Math 6.1 Geometry and Measurement

CAHSEE Math 3.4 Statistics, Data, and Probability I
363 Views

Statistics, Data, and Probability I: Drill Set 3, Problem 4. How many different avatars can be created based on the given options?

CAHSEE Math 3.2 Statistics, Data, and Probability II
224 Views

Statistics, Data, and Probability II Drill 3 Problem 2. Which two sports together make up for the preferences of more than half of all those w...

CAHSEE Math 3.3 Statistics, Data, and Probability II
198 Views

Statistics, Data, and Probability II Drill 3 Problem 3. One hundred twenty of those who were asked preferred what sport?