Central tendencies
What is the mode?
The mode occurring number
What is range?
It is equal to the difference between the largest and the smallest values
Why do we use z scores?
To be abel to compare raw score to standard deviation
Sample Mean Formula
SumX/N
What does inferential data refer to
Population data
Which central tendency is used in the z score formula?
The mean
What does variability measure
Spread or Dispersion
Mean=88, X=89, Standard Deviation=1.15
What is the z score?
.87 before table
.8078 after table
How do you find range?
Largest number in data set - Smallest number in data set
What does descriptive data refer to?
Sample data
In a normal distribution, where do the mean, median, and mode fall?
The middle/zero point
Quartile 3 is the ___ percentile
75th
If a z score is less than one standard deviation away from the mean, what does that tell us?
More than one right answer, so good luck!
Semi-Interquartile range formula
Q3-Q1/2
Roman Letters
Descriptive
Which central tendency is the most widely used?
The Mean
Why do we use standard deviations?
Given a standard deviation, we can tell in what percentile score is
if a score falls 2 standard deviations away from the mean, what does this tell us?
More than one right answer so good luck!
What changes from the population standard deviation equation to the sample standard deviation equation?
The symbols
Greek letters
Inferential
A mode is higly susceptible to sampling fluctuations and should never be _______________
The only central tendency used
If you have the variance, how do you find the standard deviation?
Square root it! And vice versa!
Explain how the percentages work under a normal distriution of scores
34.13%, 13.58%, 2.15%
Median formula
LRL+ ((50-LRLrcf)(URL-LRL)/(URLrcf-LRLrcf))
z = (x-μ)/σ
Inferential