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Statistics, Data, and Probability II Videos 30 videos

CAHSEE Math 1.1 Statistics, Data, and Probability II
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CAHSEE Math Statistics, Data, and Probability II: Drill 1 Problem 1. Which of the following tables best represents the relationship between the val...

CAHSEE Math 1.2 Statistics, Data, and Probability II
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Statistics, Data, and Probability II Drill 1, Problem 2. Based on the chart, which of the following statements is true?

CAHSEE Math 1.3 Statistics, Data, and Probability II
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CAHSEE Math Statistics, Data, and Probability II: Drill Set 1, Problem 3. Based on the following, which of the following statements is true? 

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CAHSEE Math 4.2 Statistics, Data, and Probability II 207 Views


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Description:

Statistics, Data, and Probability II Drill 4 Problem 2. Based on the graph, which statement is most likely to be supported by the data?

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Transcript

00:03

One shmoop or two?

00:05

The following graph shows points representing the relationship between the amount of time

00:09

spent walking per week and cholesterol levels of various people. 

00:13

It’s also a pretty good diagram of what the red blood cells look

00:16

like in those higher-cholesterol people…

00:18

Based on the graph, which statement is most likely to be supported by the data?

00:23

And here are the potential answers...

00:32

Can we read a scatter plot? Well, that’s what it's asking anyway.

00:37

Let’s go through the potential answers one by one.

00:41

So A says “Cholesterol levels increase as the amount of time spent walking increases.”

00:47

Well...if A were to be true, the dots would follow this kind of line like from the

00:51

origin up and to the right about a 45 degree angle –

00:55

yet here, we don’t see that at all… so A is false.

00:59

B. “Cholesterol levels decrease as the amount of time spent walking increases.”

01:03

Well B is sorta true – yes, they do decrease but not dramatically.

01:07

We’re looking for the BEST answer here so let’s keep reading.

01:11

C. “Cholesterol levels remain steady as the amount of time spent walking increases.”

01:17

Hm – no – they definitely decline – just not all that much. So C is definitely false.

01:23

OK… D. “There is no relationship between a person's cholesterol level and the amount

01:27

of time spent walking per week.”

01:29

D might be true… but it looks like there clearly is a pattern here – just not a dramatic one.

01:35

If it was dramatic, the line would look like this…

01:37

…and, well, our nation’s sidewalks might be more crowded.

01:40

But ok, clearly the BEST answer is B.

01:43

As in, “Bypass surgery.”

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