Box Plots

Box Plots

12/16/20

Reminder

A box plot measures the median, lower quartile, and upper quartile.

Each section is worth 25%.

Fill in the Blank

What was the high score on the test?

Fill in the Blank

What was the median score on the test

Fill in the Blank

What percentage of the class scored above a 72?

Fill in the Blank

What percent of the class scored between 88 & 96?

Open Ended

Do you think that this test was too hard for the students? Explain.

Open Ended

Would you expect the mean to be above or below the median? Explain.

Here's what you should have put...

• 1. The high score is 102

• 2. The median is 88

• 3. 75% got above a 72

• 4. 25% got between an 88 and 96

• 5. The test was easy. The average is 88, 75% or students passed

• 6. The mean would be BELOW the median, it is being skewed left by the long whisker,

Fill in the Blank

What percent of the sophomores spend more than 60 minutes on homework per night?

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What is the range of times that the middle 50% of the sophomores spend on homework per night?

The following graphs will be used for the rest of the questions

THE SAME GROUP of sophomores were asked about their TV habits

Open Ended

How many sophomores do not do homework?

You should have got..

• 75% did 60 minutes or less homework each nigh

• The middle 50% ranges from 20 to 60

• It's impossible to tell how many sophomores did NOT do any homework, all we know is AT LEAST one did no homework

Fill in the Blank

What percent of the sophomores watch TV for at least 15 minutes per night?

Fill in the Blank

What is the 3rd quartile for the TV time data?

Multiple Choice

Decide if the following statement is TRUE, FALSE, or CANNOT BE DETERMINED (That is, there's not enough information to say whether its true or false)

Some sophomores didn’t watch TV that

month.

• True

• False

• Cannot be determined

Multiple Choice

Decide if the following statement is TRUE, FALSE, or CANNOT BE DETERMINED (That is, there's not enough information to say whether its true or false)

25% of the sophomores spend between 48 & 60 minutes per night on homework.

• True

• False

• Cannot be determined

Multiple Choice

Decide if the following statement is TRUE, FALSE, or CANNOT BE DETERMINED (That is, there's not enough information to say whether its true or false)

In general, these sophomores spend more time watching TV than doing homework.

• True

• False

• Cannot be determined

Multiple Choice

Decide if the following statement is TRUE, FALSE, or CANNOT BE DETERMINED (That is, there's not enough information to say whether its true or false)

225 sophomores watch TV

• True

• False

• Cannot be determined

Multiple Choice

Decide if the following statement is TRUE, FALSE, or CANNOT BE DETERMINED (That is, there's not enough information to say whether its true or false)

The TV data is more varied than the homework data

• True

• False

• Cannot be determined