Term
| What is the purpose of z-scores, or standard scores? |
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Definition
- It is to identify and describe the exact location of every score in a distribution.
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Term
| Why do they tranform X into z-scores? |
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Definition
- So that resulting z-scores tell exactly where the original scores are located
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Term
| What is the second purpose of z-scores? |
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Definition
- It is to standardize an entire distribution. An example of standard distribution would be I.Q. scores
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Term
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Definition
- tells how a single data point compares to normal data
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Term
| Define what the + or - represent in a X value in a z-score. |
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Definition
- The plus sign tells whether the score is located above the mean
- The minus sign tells whether score is located below the mean.
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Term
| What does the numerical value of a z-score represent? |
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Definition
- It represents the distance from the mean by counting the number of standard deviation between the X and µ.
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Term
The locations identified by z-scores are the same for all distributions, not matter the mean or standard deviation the distribution may have.
True or False |
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Definition
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Term
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Definition
- It provides a quantive measure of the differences between scores in a distribution and describes the degree to which the scores are spread out or clustered
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Term
| What is usaully define in the terms of distance |
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Definition
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Term
| What measure how well an individual/group can score? |
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Definition
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Term
| What is important to inferential statistics? |
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Definition
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Term
| What is the first mathmatical step in solving an equation for Standard Deviation and Variance for a population? |
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Definition
To find the standard distance from the mean, for each individaul score.
Formula:
X - µ |
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Term
| What is a deviation score often represented by? |
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Definition
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Term
| What is the second mathmatical step in solving an equation for Standard Deviation and Variance for a population? |
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Definition
To caculate the mean of the deviation scores by adding up the deviation scores and divide them by N.
Formula:
µ=Deviation score/N
For N=4 and x=12
µ=12/4=3
µ=3 |
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Term
| What is the third mathmatical step in solving an equation for Standard Deviation and Variance for a population? |
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Definition
Is to get rid of signs (+) and (-); than use squared values to compute the mean spquared deviation, which is called variance.
Formula:
σ2 = SS/N
σ2= ∑(X-µ)2
σ = √σ2 |
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Term
| What is the Population Variance? |
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Definition
| It equals the mean squared deviation. Variance is the average squared distance form the mean |
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Term
| What is Standard Deviation? |
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Definition
It is the variance squared.
= √variance |
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Term
| What is the fourth mathmatical step in solving an equation for Standard Deviation and Variance for a population? |
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Definition
| It is the square root of the variance. |
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Term
What does the N = in a standard deviation.
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Definition
The total number of scores
Example:
1 2 3 4 5 6
= 6 scores |
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Term
| What is the purpose of standard deviation? |
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Definition
| To measure the standard distance from the mean. |
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Term
| What is the SS in deviation? |
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Definition
| It is the sum of the squared deviation scores. |
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Term
| How do you caculate the SS? |
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Definition
Find each divation score (X-µ)
Square each dviation score (X-µ)2
Add the squared deviations |
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Term
| What is the formula for Computational formula? |
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Definition
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Term
If you have a small groups of scores and the mean is a whole number, what formula do you use;
The definitional formula or the computational formula |
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Definition
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Term
If you have a large groups of scores and the mean is a decimal or fraction, what formula do you use;
The definitional formula or the computational formula |
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Definition
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Term
Is this a computational SS, definitional SS, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
SS/N |
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Definition
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Term
Is this a computational SS, definitional SS, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
√SS/N |
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Definition
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Term
What symbol represents sum of all in greek.
σ, √σ, or ∑ |
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Definition
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Term
What symbol represents sum of population standard deviation in greek.
σ, √σ, or ∑ |
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Definition
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Term
hat symbol represents sum of population standard deviation in greek.
σ, √σ, or ∑ |
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Definition
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Term
Is this a computational SS, definitional SS, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
σ = √σ2 = √SS/N |
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Definition
| Population Standard Deviation |
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Term
Is this a computational SS, definitional SS, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
σ2 = SS/N |
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Definition
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Term
Is this a computational SS, definitional SS, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
SS = ∑(X-M)2 |
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Definition
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Term
Is this a computational, definitional, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
SS = ∑X - (∑X)2/n
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Definition
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Term
Is this a computational, definitional, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
s2 = SS/n-1 |
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Definition
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Term
Is this a computational, definitional, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
s = √s2 = √SS/n-1 |
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Definition
| Sample Standard Deviation |
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Term
Is this a computational, definitional, Sample Variance, sample standard deviation, population standard deviation, variance, standard deviation, or population variance.
= n - 1 |
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Definition
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