🟧 Single Variable Data Flashcards

(8 cards)

1
Q

What are summary statistics?

A

Measures such as mean, median, mode, range, interquartile range (IQR), and standard deviation that describe data sets.

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2
Q

What are common ways to represent single-variable data?

A

Histograms, dot plots, box-and-whisker plots, and stem-and-leaf plots.

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3
Q

How do you find the median of a dataset?

A

Arrange the data in numerical order, then:

  • If there is an odd number of values, the median is the middle value.
  • If there is an even number of values, the median is the average of the two middle values.
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4
Q

What is the interquartile range (IQR)?

A

The IQR is the difference between the first quartile (Q1) and the third quartile (Q3).

It measures the spread of the middle 50% of the data.

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5
Q

How do you calculate the mean of a dataset?

A

Add all the values together and divide by the number of values

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6
Q

Find the median of the following dataset:
7,9,2,5,12,10,4

A

Dataset:
7, 9, 2, 5, 12, 10, 4

Step 1: Arrange the numbers in order:
2, 4, 5, 7, 9, 10, 12

Step 2: Find the middle number (since there are 7 values):

The median is the 4th number → 7
​

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7
Q

Calculate the mean of the following set of numbers:
3,7,12,15,8

A

Dataset:
3, 7, 12, 15, 8

Step 1: Add the numbers:

3+7+12+15+8=45

Step 2: Divide by how many numbers:

45/5 = 9

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8
Q

A student records the following scores on five tests:
80, 85, 92, 90, 87.
What is the range of the scores?

A

Scores:
80, 85, 92, 90, 87

Range = Highest – Lowest

92−80= 12
​

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