Research Review 2

Random

100

The way data is spread out or arranged.

Distribution

200

The average of a data set.

Mean

300

The middle value of a data set.

Median

400

How spread out the data values are

Variability

500

When dealing with sampling distributions, the letter n represents this.

What is the sample size?

Types of Distributions

100

A distribution that looks balanced on both sides

Symmetric Distribution

200

A distribution with a longer tail on one side

Skewed Distribution

300

This term creates the tail in a skewed distribution

Outlier

400

If the outlier is bigger than the rest of the data set, it is ____________. 

If the outlier is smaller than the rest of the data set, it is ____________. 

Skewed right, Skewed left

500

A symmetric distribution with one center peak

Bell shaped distribution

Name that Distribution

100

Data Points: 1, 2, 2, 2, 3, 15

Skewed right

200

Data Points:  40, 42, 44, 45, 46, 48, 50

Symmetric/Bell-Shaped distribution

300

Data Points: 1, 1, 2, 3, 4, 12

Skewed Right

400

What type of distribution is characterized by Mean = Median. 

Bell-shaped distribution.

500

What is the difference between a symmetric distribution and a bell-shaped distribution?

Symmetric distributions can have 2 peaks.

Bell-shaped distributions always have 1 center peak.

Steps for Standard Deviation

100

This measures how far data values tend to be from the mean

Standard Deviation

200

When standard deviation  is ___________ , 

• Data values are close to the mean

• Less spread

• More consistency

Small

300

When standard deviation is ____________,

• Data values are far from the mean

• Greater spread

• Less consistency

Large

400

Standard Deviation uses this to measure spread.

Squared distances

500

What are the 5 steps for standard deviation?

1. Mean

2. Deviation

3. Square Deviations

4. Find Variance (Average squared deviations)

5.  Find Standard Deviation (Sqrt of the Variance)

Meaning and Calculating Standard Deviation

100

Mean = 70

Standard Deviation = 5

What number is 2 standard deviations above the mean?

80

200

Mean = 64

Standard Deviation = 7

What number is 2 standard deviations below the mean?

50

300

In a bell-shaped distribution, this % of the data is found within 2 standard devaitions of the mean.

95%

400

In a bell-shaped distribution, this % of the data is found within 3 standard devaitions of the mean.

99.7%

500

Mean: 55

Standard Deviation: 5

Find the values at each point on a bell curve :

-3 SD:?   -2 SD:?   -1 SD:?   Mean:?   +1 SD:?   +2 SD:?    +3 SD:?        

-3 SD:40   -2 SD:45   -1 SD:50   Mean:55  +1 SD:60  +2 SD:65  +3 SD:70