Standard Deviation and a Bell Shaped Curve Bozeman Biology Video on Standard Deviation Standard deviation measures the spread or the variation in the data 68 of the individuals are within 1 standard deviation ID: 643883
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Standard Deviation and Standard Error of the MeanSlide2
Standard Deviation and a Bell Shaped CurveBozeman Biology Video on Standard Deviation
Standard deviation measures the spread or the variation in the data
68% of the individuals are within 1 standard deviation Slide3
Do men or women have a higher standard deviation? Slide4
What does that mean?
S = standard deviation
∑ = sum
√ = square root
n = # of data points = sample size
X = value
X = mean Slide5
Calculate standard deviation of the following data set:
S = √10/4
S = 1.58
= 10
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DATA SET Slide6
Calculating SD using Excel
Enter data into the cells
To calculate the MEAN (Average) click an empty box and type the letters in black. The highlight data letters in white are not typed, just highlight the data:
=average(
highlight data)
To calculate SD
=
stdev
(
highlight data
)Slide7
Standard Error of the Mean SEx
or SEM
Bozeman Biology on SEM
Standard deviation divided by the square root of the sample size Slide8
Graphs and error bars…..Slide9
Correlation does NOT = Causation Slide10
Sample Brine Shrimp Data