Chapter 3 Flashcards
Five Measures of Location
arithmetic mean
weighted mean
median
mode
geometric mean
Purpose of a Measure of Location
is to pinpoint the center of a distribution of data
Purpose of Dispersion
often called the variation of spread in the data
Discuss the meaning of the variables in population mean….
…….
Discuss the meaning of the variables in the sample mean
……….
A parameter is a characteristic
…..of a population
A statistic is a characteristic
of a sample
Important Properties of Arithmetic Mean
Disadvantage of Mean
How to answer population question?
lowercase mu
How to answer sample question?
X bar
How to answer weighted question?
X sub w
What does everything mean in the weighted equation?
…….
Weighted Mean: What does “w” actually mean?
frequecny counts
The Median:
What is it?
What is not afffected by?
What levels of measure is it used for?
The Mode: What is it?
What is not affected by?
Weighted Mean: How can a frequecny distribution be used in relation to weighted mean?
can be used to find weighted mean
positively skewed distribution: Which is the highest and why?
- Mean
- Median
- Mode
Negatively Skewed Distribution: Which is the highest and why?
1) Mode
2) Median
3) Mean
Geometric Mean: Will Always be less or equal to what?
Arithmetic Mean
Geometric Mean: How to do increases and decreases(think what you add or subtract from the decimal)
add or subtract 1
Small Masure of Dispersion vs. Large Measure of Dispersion
Mean Deviation
-the avergae by which values in a population or sample vary from their mean
Mean Deviation: What should be done first and describe what the variables mean in the equation?
- find the mean first
- …….check the book
Median: What must you do before finding a median?(this step is crucial)
order them from least to greastest
