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STAT 09-28-16

Descriptives (Test 1)

Descriptive Statistics Graphical and numerical summaries
Graphical Summaries Pie chart, bar graph, and line chart
Goal of graphical summary Give someone lots of information using a picture
Counting data in excel Data->Advanced->Ok
Data counting function =countif(range, criteria)
Quantitative Data Graphical summaries such as histogram, dot plot, scatter plot
Linear A line fits the data well
Scatter plot Relationship between two variables
Y Response variable
X Explanatory variable
Correlation vs. Causation Showing that two variables are correlated (associated) is not the same as showing one variable causes the other
Numerical Summaries summarize data using numerical summaries to get information from our data
Measures of central tendency Mean, median, mode
Measures of spread Interquartile range (IQR), range, variance, standard deviation
Mean average
Median middle
Mode most often
Interquartile range (IQR) Q3 - Q1
Range greatest - least
Robust not influenced by extreme values
Standard Deviation square root(variance)
Variance how far an observation is from the mean of the data set
Created by: Spencer Gowey Spencer Gowey