Unit 1: Exploring One Variable Data Flashcards

1
Q

“Describe the distribution…” means to write sentences about…

A

SOCS +C

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2
Q

SOCS +C

A

Shape, Outliers, Center, Spread, +Context

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3
Q

z-score formula

A
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4
Q

What’s the shape of this histogram?

A

skewed right

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5
Q

What’s the shape of this histogram?

A

skewed left

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6
Q

What’s the shape of this histogram?

A

symmetric unimodal

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7
Q

What’s the shape of this histogram?

A

uniform

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8
Q

What’s the shape of this histogram?

A

symmetric bimodal

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9
Q

What types of displays can be used with categorical variables?

A

Pie chart, bar graph, segmented bar graph, side-by-side bar graph, mosaic plot

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10
Q

Name the type of variable that only uses names or categories of the data.

A

Categorical variable

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11
Q

Name the type of variable that is a measurement.

A

Quantitative variable

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12
Q

What types of displays can be used with one quantitative variable?

A

stem plot, box plot, histogram, dot plot

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13
Q

What does this symbol represent?

A

population mean

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14
Q

What does this symbol represent?

A

Sample mean

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15
Q

What does this symbol represent?

A

population standard deviation

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16
Q

What does this symbol represent?

A

sample standard deviation

17
Q

Measures of center are…

A

mean or median

18
Q

Measures of spread are…

A

standard deviation, IQR, or range

19
Q

IQR =

20
Q

Range =

21
Q

Definition of standard deviation

A

The average distance the data strays from the mean

22
Q

Interpret a z-score

A

the number of standard deviations above/below the mean

23
Q

When do you use the mean as the center?

A

When the distribution is symmetric

24
Q

When do you use the standard deviation as the spread?

A

When you have used the mean as the center

25
When do you use the median as the center?
When the data is skewed or you are working with box plots
26
When do you use IQR as spread?
When you used the median as center